Unfortunately, sometimes you can find quite serious problems with turning on computers and starting operating systems, although up to certain point There were no signs of trouble. It happens that most often the computer turns on, but the operating system does not start. It is these situations that will be discussed further. Let's look at questions related to why the computer won't boot and what to do in such situations. There are several universal solutions here.
The computer turns on, but the operating system does not start: reasons
Among all the possible situations when failures occur at the loading stage, several typical cases can be identified.
There are three options:
- a black screen appears;
- Blue screen BSoD occurs;
- The operating system starts, but cannot fully boot.
In the first case, when the computer does not start (the boot does not turn on), messages may appear on a black screen indicating physical or software problems. In the simplest case, when nothing serious happens, the system may report that, for example, the keyboard is missing (for desktop PCs). The simplest solution is to connect it and reboot.
If the computer turns on, but the boot does not start, and instead warnings about software failures or missing files appear on a black screen, there can be many reasons for this system behavior. Among them, first of all, we can highlight problems with the hard drive, damage to the operating system (accidental or intentional deletion of system components or registry entries), exposure to viruses, incorrect boot sector entries, conflicts random access memory etc. By the way, if a blue screen pops up, this is more related to the “RAM” or recently installed drivers devices that cause conflicts not at the software level, but at the physical level.
What to do if the computer does not boot and the operating system does not start for the above reasons? Depending on the situation, there are several solutions. To an uninitiated user, they may seem quite complicated, but in certain situations only they can be used to resuscitate the system. Therefore, you will have to spend both time and effort.
The computer turns on but does not boot: what to do first?
So, let's start with the simplest thing. Let's assume that a short-term technical failure has occurred in the system, for example due to incorrect shutdown or power surges.
As a rule, almost all Windows modifications used today usually automatically activate startup upon restart. If this does not happen, before starting the system you will have to use the F8 key to call up the additional boot menu (Windows 10 uses a different method).
The computer turns on, but the operating system does not start? There's no need to get upset. Here in the very simple version you can select the line to load the last working configuration. If everything is in order with the system components, the system will boot without problems. If this does not help, you will have to use the troubleshooting section, and sometimes even trying to boot into safe mode.
Possible viral infection
Unfortunately, viruses can also cause such situations. What to do if the computer does not turn on? Ways to solve this particular problem boil down to using a powerful one that could check for threats even before the OS itself starts.
Among the variety of anti-virus software, it is especially worth noting disk utilities that start directly from an optical media or USB device and have their own boot records and even GUI like Windows. One of the most powerful tools is Kaspersky Rescue Disk. Its use can guarantee almost one hundred percent detection of viruses, even those hiding in RAM.
RAM conflicts
Now let's see what to do if the computer does not boot and instead a blue screen appears. As already mentioned, most often this indicates problems with drivers and RAM. We’re not touching the drivers yet, but let’s look at the RAM.
The proposed solution to the issue of if the computer does not boot is mainly designed for stationary PCs. In this situation, you should remove all memory sticks, and then insert them one by one and check the load. Perhaps one of them is the link that causes failures. This may occur when trims from different manufacturers are added.
If the system can somehow be loaded using the same safe mode, the RAM should immediately be checked using the Memtest86+ utility, which will help identify the true cause of the problem.
The system does not see the hard drive
Now the worst situation is when the computer does not boot. The causes and ways to eliminate them may be related to hard drive.
A hard drive can have both software and physical problems, although sometimes that’s not even the issue. The problem may be completely trivial: the user in the BIOS settings has set the boot priority from a removable device, for example, from optical disk, which in this moment is in the drive, but is not a system file. You just need to remove it and download again.
On the other hand, another problem that the computer does not start (the system does not start) may be due to the fact that bootloader is damaged and records of the corresponding sector. The solution to this situation will be discussed a little later. But in the simplest case, you can try to restore disk data using Recovery utilities.
Sometimes changing the settings of the primary BIOS input/output system also helps. Here you need to find the section related to setting up the hard drive, and in the SATA configuration parameters, deactivate the use of AHCI mode.
Finally, the hard drive may also have purely physical damage, and this cannot be done without outside intervention.
Using the installation disc
Many users clearly underestimate the help that the installation or system image can provide in solving problems associated with situations when the computer turns on, but the operating system does not load.
Firstly, almost any kit includes a so-called recovery console, with which you can eliminate many software failures, and secondly, you can use the command line here. This, by the way, is the most effective method. Next it will be clear how this works.
Problems with the BOOTMGR bootloader
It is believed that the most common problem when the computer turns on, but the operating system does not start, is damage to the Windows boot manager (Boot Manager). In this case, the system just writes that there is no system partition (it simply does not see the hard drive).
This problem can be corrected if you start with boot disk and transition to command line in the recovery console, which can be opened by pressing the “R” key. Next, you need to first use the check disk command and then fix (restore) boot records.
The whole sequence looks like this:
- chkdsk c: /f /r;
- Bootrec.exe /FixMbr;
- Bootrec.exe /FixBoot.
After entering commands, punctuation marks are not placed, but the enter key is pressed. If for some reason executing these commands does not have a positive effect, you can alternatively use a complete rewrite of the boot sector, which is performed by the Bootrec.exe / RebuildBcd command. If HDD has no physical damage, this should work, as they say, one hundred percent.
You can also use some third-party utilities. The most suitable program seems to be a tool called MbrFix, which is included in the Hiren’s Boot CD. After calling it, for example, for Windows 7, provided that this particular system is installed, and only on one disk (there is no partitioning), the following should be written:
- MbrFix.exe /drive 0 fixmbr /win7.
This will save the user from having to make changes to boot records, and the boot will be restored.
Problems accessing the NTLDR file
When a message appears that a given component is missing from the system, a boot commit is first applied, as in the previous case.
However, if the result is not achieved, you will need to copy the original file to the root of the system partition. For example, if the drive is "C" and the drive is "E", the command would look like this:
- E:\i386> copy ntldr C:\ (after copying, the system will boot without problems).
Damaged or missing HAL.dll file
If the computer turns on, but the operating system does not load in normal mode, the reason may be a damaged component HAL.dll (a corresponding notification may be displayed on the screen).
In this situation, you need to boot the system in safe mode, call the command console and write the following line in it:
- C:\windows\system32\restore\rstrui.exe (then press the Enter key and restart).
Instead of a total
Here is a brief summary of everything that concerns solving the problem of the inability to start the operating system. Naturally, the issues that the cause could be low nutrition, refusal CMOS batteries, loose connection of cables, presence of dust inside the system unit or other malfunctions. But in software terms, the above methods work flawlessly.
This site already had more than one article describing the procedure in cases where the computer does not turn on for one reason or another. Here I will try to systematize everything written and describe in which cases which option with most likely will help you.
There are a variety of reasons why a computer may not turn on or boot, and, as a rule, based on external signs, which will be discussed below, this reason can be determined with a certain degree of confidence. More often the problems are caused software glitches or missing files, records on the hard drive, or less often - malfunctions of the computer hardware.
The reasons for this behavior may vary, but as a rule they are associated with a malfunction of the power supply or overheating of the computer. If, after turning on the PC, it turns off even before starting Windows boot, then most likely the problem is with the power supply and it may need to be replaced.
If automatic shutdown computer occurs some time after its operation, then overheating is more likely and most likely, it is enough to clean the computer from dust and replace the thermal paste:
When turning on the computer writes an error
Have you turned on your computer, but instead of Windows loading you see an error message? Most likely there is a problem with some system files, the boot order in the BIOS, or similar things. As a rule, it is quite easy to fix. Here is a list of the most common problems of this kind (follow the link for a description of how to solve the problem):
- - how to fix the error
- Non system disk or disk error (I haven’t written about this error yet. The first thing you should try is to disconnect all flash drives and remove all disks, check the boot order in the BIOS and try to turn on the computer again).
Computer beeps when turned on
If a laptop or PC starts beeping instead of turning on normally, you can find out the cause of this squeak by contacting.
I press the power button but nothing happens
If after you pressed the ON/OFF button, but nothing happened: the fans did not work, the LEDs did not light up, then first of all you need to check the following things:
- Connection to the power supply network.
- Is the surge protector and switch on the back of the computer's power supply (for desktop PCs) turned on?
- Are all the wires fully plugged in where they need to be?
- Is there electricity in the apartment?
If all this is in order, then you should check the computer's power supply. Ideally, try to connect another one that is guaranteed to work, but this is a topic for a separate article. If you do not feel like an expert in this, then I would advise calling a specialist.
Every user may sooner or later have problems starting their computer. Problems with loading your computer are not always caused by a breakdown; very often we are the cause of this, and this can be fixed very quickly and easily. In this article, we will look at the most common reasons why your computer does not start, so that you can quickly solve the problem and you do not have to call a specialist.
This can be either the simplest reason for the computer not turning on, or the most complex. Let's start with a simple one. If your computer does not turn on, the most common reason is a lack of power supply to it. This happens as a result of several factors:
- Power supply turned off
- The power cord is not inserted properly system unit
- The computer power cord is pulled out or not inserted properly.
- The stabilizer or UPS does not work
- The surge protector or socket does not work
Another fairly common reason why the computer does not turn on is the incorrect connection of its components in the system unit; this quite often happens when users clean the computer themselves and at the same time disconnect the wires or accidentally touch them.
The next reason is a breakdown of the power supply, this is quite frequent breakdown in computers, since on average power supplies last 3 years, after which they often fail. If the power supply is in working condition, then there are 2 options for failure: either the motherboard has failed, or the contacts have oxidized.
Computer won't turn on, but fans work
Your computer starts but nothing happens? Check all contacts and connections of components in the system unit. Most often this happens after self-cleaning the inside of the system unit and components. Also, in some cases, resetting the BIOS helps; to do this, you need to short-circuit the corresponding terminals to motherboard and restart the computer, making the settings of the reset Bios before starting.
The computer does not turn on and beeps
If the computer turns on and beeps, it means that one of the devices is missing or connected incorrectly. By the nature of the sounds made, or more precisely by the number of long and short squeaks, you can determine what exactly the problem is. It may be necessary to remove and reinsert this component, clean the contacts, or replace it due to failure.
The computer turns on but does not boot
If the computer turns on but does not start, then this happens for three reasons, let's look at them:
- The computer does not see the hard drive on which the operating system is installed
- The system boot loader does not specify or incorrectly specifies the partition from which it needs to boot
- Problems with the operating system
The computer turns on, but there is no picture
If the computer turns on, but there is a black screen, then the problem is probably that the monitor is not connected correctly. To do this, check that the cable going to the monitor is connected correctly, both from the side of the system unit and from the side of the monitor itself. Then check the settings on the monitor itself to ensure the correct connection type is set there: VGA, DVI or HDMI. Also check the power cable going to the monitor to ensure it is connected correctly.
The next reason why there may be no image on the monitor is a video driver failure. Try booting your computer in safe mode and reinstalling the video driver. If this does not help, try connecting the monitor to the integrated video card, removing the discrete one. If an image appears, then there is a problem with the video card (try cleaning the contacts and inserting the card well into the connector), if there is no image, then it is possible that the problem is in the monitor.
The computer turns on and immediately turns off
This situation occurs for two reasons: the cooling cooler has failed or the power button is jammed. Therefore, check the functionality of the cooler, if everything is in order with it, then disconnect the start button from the motherboard and start the computer by shorting the start terminals (be careful and do not do this if you have no experience!), if the computer starts and does not turn off, repair the button .
In fact, there can be many reasons why your computer stopped turning on. We have prepared for you comprehensive material that describes the main reasons why the computer does not turn on, their description and possible actions to correct them.
We hope that this instruction will be useful to you. You can ask all questions in the comments on this page and we will try to answer them. If you cannot identify and fix the problem yourself, you can always contact us for free* diagnostics and computer repair services.
We do not bear any responsibility for any manipulations you have made with the software or hardware of your computer in accordance with these instructions and do not provide guarantees for restoring the computer’s functionality. Remember that this material was prepared by specialists and computer repair work should be carried out by professionals.
The main symptoms of a computer not turning on
This part contains the main, often common symptoms of a computer not turning on, actions and the sequence of their implementation, by taking which you can bring the computer into working condition.
Basic procedure when the computer does not turn on. Check:
- Is there voltage in the socket, connecting, for example, a kettle?
- Is the power cord connecting the power supply and the outlet faulty?
- Is the power button on the power supply turned on?
- Is the computer power button pressed correctly?
- Correct power supply to the computer monitor
- Are the system unit and monitor connected with a connecting cord?
- Open the system unit and conduct a visual inspection
- Correct connection of wires inside the system unit
- Disconnect all peripheral equipment and try turning it on
- Install a new BIOS battery or disable it temporarily
- Disconnect the video card and all other cards from the PCI slots
- Reconnect the RAM sticks one by one
- Leave only the motherboard, processor and power supply
Following these recommended steps may get your computer back into working order. If the above recommendations did not lead to the desired result, then a detailed clarification of the reasons for the computer’s refusal to turn on is required.
Let's look at the main reasons and symptoms why your computer won't turn on.
- No voltage at the socket
Use a tester to check that the voltage in the outlet is correct or connect some other device to the outlet and check whether it will work from it. - The power cord is faulty
It's quite easy to check if your computer's power cord is faulty. You need to measure the correctness of voltage transmission on both sides with a tester or take another power cord, for example, from a monitor. - The power supply is switched off
There is a switch on the outside of the power supply. Try switching it to a different position and see if the switch is broken. On most power supplies, this switch should make a mechanical switching sound (click) when switched to another position. - BIOS battery is dead
Each motherboard has a separate firmware (BIOS) that is supported by a coin cell battery. If this battery is completely discharged, the computer may not turn on in some cases. We recommend replacing the battery with a new one. - RAM strips have moved
At external influence on the system unit (shock, movement, vibration), the RAM strips may move and the computer will not turn on. We recommend disconnecting the RAM and trying to turn it on. Then connect the RAM and try to turn it on again. - The connecting cables are disconnected
Open the cover of the system unit and visually inspect for any disconnected wires. Check that the wires are securely fastened. - The component part has failed
Disconnect all optional cards from the motherboard: sound card, TV tuner, video card, Wi-Fi adapters, controllers and more. Here you need to use the method of elimination - take out one board, try to turn it on, if when you disconnect one board the computer turns on, then that means it’s the problem. - There is a lot of dust in the computer
When a lot of dust accumulates in the system unit, this can lead to serious consequences, including failure of all components with the prospect of purchasing a new computer. If there is a lot of dust, then your computer needs cleaning. - Severe overheating of the processor and/or video card
The processor can heat up to hundreds of degrees in a few seconds. If the computer does not turn on due to the processor heating up quickly, then you need to replace the thermal paste. Also, dust could get under the processor or it could “move out” (you need to remove the dust and check that the processor is installed correctly in the socket). - The power button is broken
If the reason the computer does not turn on is a broken power button, then you can check this quite simply. Open the system unit and identify two wires running from the power button to the motherboard. These two wires will be connected with plastic connectors to the motherboard. Disconnect them and short the two contacts with something metal that allows current to pass through. Remember to take precautions when working with voltage. - It smelled like something was burning
If you smell something burning, immediately turn off the power to the computer and call a specialist. Most often, power supplies burn out. If you are confident and sure that the power supply has burned out, buy a new one and connect it. - The computer beeps and won't turn on
If a squeak is heard from the depths of the system unit, these are the so-called sound signals BIOS about the state of the computer. But what do they mean? - you ask. You can find information about what this or that signal means on our website in the section on signals and BIOS codes. Having deciphered BIOS signal you can understand what the problem is. Detailed information about BIOS beeps and signals. - Some numbers light up on the motherboard
If the computer does not turn on, but the motherboard has BIOS status indicators in the form of a digital-alphabetic display, then from the codes issued by these displays you can find out at what stage the computer stops turning on/booting and take certain actions in accordance with this. - Peripherals are not connected correctly
There are cases when people, out of ignorance, connect peripheral equipment to the wrong connectors to which it should be connected. Because of this, the computer may not turn on. Disconnect absolutely everything external devices(camera, mouse, keyboard, etc.) from the computer and try to start it. - There are smudges and swelling on the motherboard
If you measure that some part (capacitor) is swollen on the motherboard or notice strange leaks of an unknown substance, then most likely, at a minimum, you will have to replace the motherboard with a new one. - All or some fans do not turn on
Most likely the power supply or motherboard has failed. They need to be repaired or replaced with new ones. We recommend checking the connection of the wires coming from the fans to the motherboard. - The computer turns on and then turns off immediately
There are several reasons for this:- The power supply has failed and needs to be replaced
- The processor overheats (the thermal paste needs to be replaced)
- Motherboard malfunction (repair or replace)
- Other components are faulty (diagnostics required)
- The lights are on, the coolers are spinning, the computer does not turn on
Possible options for not turning on the computer in descending order of probability:- BIOS settings are lost or the chip is faulty
- RAM fault
- Motherboard is faulty
- Everything works, there is sound, but there is no image on the monitor
Check the connecting cable between the video card and the monitor, this may be the only problem. The second option is that the video card has failed. If the video card is separate, then you can try installing another video card and check. If there is also no signal with the new video card, then the monitor is most likely broken. - The computer does not turn on and a blue screen appears
The so-called blue screen of death appears due to problems in the operation of components, their malfunctions, incompatibility, dirt and problems in the operation of the Windows operating system. Blue screen appears and displays an error code by which you can determine the malfunction and, if possible, eliminate it. - The computer does not turn on and a black screen appears
In most cases, a black screen is evidence of a component failure. Often when there is a malfunction hard drive and this very black screen appears, it also appears when the RAM is not working correctly and a number is missing system files from the hard drive. In this case, diagnostics are required, as a result of which the cause of the malfunction will become clear. - The computer keeps rebooting and cannot turn on
If at some stage of loading the operating system the computer starts to reboot and the whole process repeats all over again, this may be the result of a malfunction in the operating system or a malfunction of the hard drive. You can try to restore the operating system to an earlier date. A hard drive can have two problems - physical and logical. The logical one can be eliminated using software, and physical only with the help of mechanical repairs. If the hard drive is physically faulty and there is really valuable information on it, then you can restore it, but we do not recommend using such a hard drive later. - The computer does not boot and some clicking noises are heard
If you turn on the computer and the operating system does not load and you hear quiet or loud clicks inside the system unit, then the hard drive is most likely broken. Typically physically broken hard disks after repair they are not used, since the reliability of their operation may be extremely low. - The computer does not turn on for a long time (boots)
If the computer still turns on, but the operating system takes a very long time to load, then most likely this may be evidence of logical or physical malfunctions of the hard drive, as well as evidence of a large number of errors in the operation of the operating system. In case of errors in the operation of the OS, software prevention of its operation is required. Sometimes the computer slows down due to overheating of components.
Addition #1
Additional reasons for the computer not turning on. Yes, we sometimes update and supplement the material to make it even more useful. If you didn't find what you need above, maybe you can find it below. And if you have encountered some case not described here, then your description of it in the comments to the article will be useful to other people.
- The processor is broken
Due to overheating, the processor could burn out. Sometimes it is impossible to notice this visually - as if nothing had happened to him. You need to see if the lid has come off, if it smells burnt, if there are burnt areas, test it on another computer or install another processor (working) in the computer for testing. It is also worth carefully checking whether all the legs are intact. - Chipset
Due to overheating, foreign objects (dust, thermal paste), rough mechanical impact, voltage drop, short circuit and other reasons, the chipset may fail. You need to carefully remove the processor and visually check for damage. The chipset, like some processors, has legs - inspect them for bending. - BIOS firmware
Due to malware or power surge BIOS firmware could be damaged, causing the computer to stop turning on normally. Check if it works correctly Motherboard BIOS boards to an ordinary person(not a master) at home is not possible - you need equipment (programmer), pullers, specialized software, knowledge and experience. - Overclocked processor and unlocking
Due to improper overclocking of the processor, the computer may also not turn on. If the processor is overclocked and you have access to the BIOS settings, then you can play with the settings for FSB frequencies, RAM, memory timings, multiplication factors, voltages, etc. If you don’t have access, then you can try: a) disconnect the BIOS battery; b) disconnect the jumper on the motherboard; c) carefully study the options for canceling overclocking in the instructions for the motherboard. - Incompatible software (drivers)
After installing or updating various software, you may experience incorrect work systems. Most often this is due to driver malfunctions, except in cases of malicious code. In this case, you can try booting the system in safe mode and uninstalling previously installed software. An alternative is to restore the system through a system image, but that's a different story. - The motherboard is shorting
If the motherboard is poorly secured, incorrectly secured, or there is a foreign conductive object, for example, an ordinary screw, between it and the case or other component part, then short circuits often occur. Inspect the system unit for foreign objects. - Reboot and Select Proper Boot Device...
If you see such an inscription on the screen, then in most cases this is due to a problem in work hard disk - it is broken, poorly secured, or the files necessary for normal operation of the system are damaged in one way or another. There are also other reasons and there are many of them. We recommend that you find an article about this on our website; everything in it is chewed down to the smallest detail. - Malicious code
Malicious code can do almost anything to a computer - from a simple prank to damaging components. If the computer reacts in any way, we recommend loading a virtual OS or connecting disks to a working system and checking the integrity of the OS files, as well as the presence of malicious code. - Lack of power supply power
Over time, power supplies “run out” (lose their former power reserve). And if everything worked fine before, but over time the PC began to sometimes turn off or you installed a new component and the PC does not start with it, then this is one of the signs of a lack of power in the power supply. It is worth determining the required amount of energy consumption of all hardware and comparing it with the power of the power supply, including measurements with a tester. - Oxidation
Due to high humidity and liquid, components oxidize and this is noticeable to the naked eye (oxides, darkening). If there are noticeable traces of oxidation (minor) on the motherboard, RAM connectors, video card and other parts, you should get rid of them and then, perhaps, the computer will start and work normally again. If traces of oxidation are significant, then only an experienced person should deal with them. - Does not turn on after a thunderstorm or power outage
If there was a thunderstorm and the PC does not turn on after it, then in 99% of cases this is a hardware failure. Which one exactly? - Anything can burn out, but most often power supplies and motherboards fail. If the PC does not turn on after a power outage, then the power supply and other components may have failed, and the BIOS settings and hard files disk. - Doesn't turn on after a long period of inactivity
If you are left idle for a long time, connected or unconnected, the options may be something like this: oxidation of parts (needs to be cleaned), BIOS battery is dead (change), fuse is blown (when connected to the network), dust gets into unnecessary places (clean), capacitors are depleted , one of the boards has dried out (this happens after a very long period of inactivity). There are other situations due to a combination of circumstances. - Stuck, rebooted and won't turn on anymore
This option is one of the most common. Most often, the computer freezes due to hardware problems caused by a variety of reasons: malicious code, increased long-term load, errors in the system kernel, faulty third-party software, OS updates, voltage surges and many other reasons. We advise you to use the recommendations at the beginning of the page, read the article itself and the comments to it.
In fact, if the computer does not turn on, you can determine the reason yourself, without having any skills. In this case, there are not many reasons, and you can determine what has gone wrong in literally 5 minutes. This is exactly what I want to talk about today, how to do independent computer diagnostics.
To avoid filling your head with unnecessary information, use the article navigation and go straight to the section with your symptoms.
The computer does not turn on and beeps
Let me guess, you probably opened the computer to clean it or change components? But, there are times when no one touched the computer, and it itself began to make squeaks when turned on. Be that as it may, the speaker gives a signal that something is connected incorrectly or is out of order.
Your PC can beep in different ways, it can be: short/long beeps, 3-5 beeps, or even continuously. Each of these signals indicates a specific problem, but each BIOS has its own signals. First you need to determine what kind of BIOS version. The easiest way is to remove the PC cover and look at it, look for a chip there with the inscription BIOS, and under it there will be its version (AWARD, Phoenix, AMI, Intel, UEFI).
Now that you know what BIOS you have, remember the number of signals, look at the table below and it will become clear what your problem is.
BIOS Award Signals
| Signal type | |
| 1 continuous signal | Problems with the power supply. |
| 1 repeating long | Problems with RAM. |
| 1 long + 1 short | RAM fault. |
| 1 long + 2 short | Video card error. |
| 1 long + 3 short | Problems with the keyboard. |
| 1 long + 9 short | Error reading data from ROM. |
| 2 short | Minor faults |
| 3 long | |
| Continuous sound | The power supply is faulty. |
AMI BIOS signals
| Signal type | Decoding and what it means |
| 2 short | RAM parity error. |
| 3 short | Error in the first 64 KB of RAM. |
| 4 short | |
| 5 short | CPU failure. |
| 6 short | Keyboard controller error. |
| 7 short | Motherboard failure. |
| 8 short | Video card memory failure. |
| 9 short | BIOS checksum error. |
| 10 short | Cannot write to CMOS. |
| 11 short | RAM error. |
| 1 dl + 1 cor | The computer's power supply is faulty. |
| 1 dl + 2 cor | |
| 1 dl + 3 cor | Video card operation error, RAM malfunction. |
| 1 dl + 4 cor | No video card. |
| 1 dl + 8 cor | The monitor is not connected, or there is a problem with the video card. |
| 3 long | Problems with RAM, test completed with error. |
| 5 cor + 1 dl | There is no RAM. |
| Continuous | Problems with the power supply or PC overheating. |
Phoenix BIOS Signals
| Signal type | Decoding and what it means |
| 1-1-4 | CPU error. |
| 1-1-4 | Cannot write to CMOS. The battery on the motherboard is probably dead. Motherboard failure. |
| 1-1-4 | Unfaithful check sum BIOS ROM. |
| 1-2-1 | The programmable interrupt timer is faulty. |
| 1-2-2 | DMA controller error. |
| 1-2-3 | DMA controller read or write error. |
| 1-3-1 | Memory regeneration error. |
| 1-3-2 | RAM test does not run. |
| 1-3-3 | The RAM controller is faulty |
| 1-3-4 | The RAM controller is faulty. |
| 1-4-1 | Error address bar RAM. |
| 1-4-2 | RAM parity error. |
| 3-2-4 | Keyboard initialization error. |
| 3-3-1 | The battery on the motherboard is dead. |
| 3-3-4 | Video card malfunction. |
| 3-4-1 | Video adapter malfunction. |
| 4-2-1 | System timer malfunction. |
| 4-2-2 | CMOS termination error. |
| 4-2-3 | Keyboard controller malfunction. |
| 4-2-4 | CPU error. |
| 4-3-1 | Error in RAM test. |
| 4-3-3 | Timer error |
| 4-3-4 | Error in RTC operation. |
| 4-4-1 | Serial port problem |
| 4-4-2 | Parallel port problem. |
| 4-4-3 | Problems with the coprocessor. |
In my practice, it most often beeps due to RAM. The fix is quite simple: take out the RAM, clean the contacts and firmly insert it into place until the fasteners click. As for the other sounds, there is a lot of information on the Internet for each of these errors that is easy to find. I see no point in describing it, the article is already cumbersome.
The computer won't turn on at all
If you press a button and the computer does not turn on at all, i.e. no emotions, sounds, squeaks, no indicators light up - first check the power supply. If you have changed the outlet, tightly connected the power cable and there is still silence, remove the PC cover and turn it on. If it spins, then scroll down the page, but if nothing happens, we will check for functionality.
How to check the power supply
- Unscrew the power supply from the computer case and disconnect all wires. Remove the power supply from the computer.
- Take a paperclip and break it in half to make a letter U.
- Take the thickest wire harness with the largest hole (that you disconnected from the motherboard) and insert a paperclip to close it black And green the wire:
- Connect the power cable to the power supply and plug it into a power outlet. Important!!! Do not hold the power supply in your hands and make sure that all wires are disconnected from the motherboard. fees.
Now one of two things: the power supply will either hum and work, or there will be silence. If the power supply starts working by shorting the black and green wires, then the problem is in the motherboard; if there is silence, then you need to buy a new power supply.
Self-repair of power supply: you could write about how to restore the power supply, but I’m more than sure that if you could do it, you wouldn’t be reading this. In addition, often after improper repair of the power supply, other components burn out. I strongly recommend buying a new one (it’s not expensive) and saving your computer and your time.
The computer does not turn on, but the system unit fans are working
It’s not a pleasant situation in which almost everything is unclear. This symptom may hide many breakdowns, which will have to be sorted out one by one to understand what exactly happened.
- PSU is faulty. Perhaps it provides tension, but it is not enough. First, open it up, make sure that there are no traces of burnt parts, liquid on the board from capacitors, and check the capacitors so that they are not swollen as in this photo:
If you find them, most likely this is the problem. The power supply works, but not on full power and the computer lacks this. To make sure, take a working power supply from someone and install it for yourself to make sure.
- Video card failure. Your computer is running at full capacity i.e. Does it sound the same as before the breakdown? If yes, connect the speakers to the computer, turn it on and wait for the system greeting (OS boot sound). If this happens, you see that the PC is working, but there is simply no image, this means that the video card is faulty.
- BIOS crashed. This happens, it even happened to me. To try to fix it, turn off the computer, remove the cover, take out the battery (the size of 5 kopecks, similar to the battery in a scale) and wait 20 minutes. Then insert it into place and turn on the computer. If it helps, the BIOS has crashed and I would recommend checking for updates for your motherboard. fees.
- The problem is in the components. Almost always in such cases, the speaker tells you what exactly is wrong with the computer, but it is possible that you do not have one or it is not working properly. Disconnect all components one by one until you find the one with the problem.
Start with your video card. If you have an integrated one and an external one, try removing the external one and connecting the monitor directly to the motherboard. If that doesn't help, remove the RAM and then try inserting it into another slot. Disconnect the HDD, if this is the case, the image will appear.
- Checking the motherboard. Do you see a large chip on the board (like a box of matches), perhaps an aluminum radiator is installed on it?
This is a chipset worth checking out. Turn on the computer and hold this chipset with your finger for 3-5 minutes. If it gets very hot, it means the bridge has burned out. I do not recommend soldering it, because the computer will not work for a long time and after a short time the breakdown will recur.
You can also watch the video, it’s quite possible that I missed something, and I haven’t encountered anything at all:
If nothing helps, it is more than likely that your motherboard is burned out. As I said above, there is no need to solder it, because the next breakdown is not far off.
The computer does not turn on the first time
Most likely, you have swollen capacitors somewhere in your power supply or on the motherboard (see example picture above), which is why this is happening. If I'm right and you find them, immediately turn off the computer and resolder them or take the PC to service center. Until your computer does not turn on the first time, and then the entire motherboard may burn out!
Reason #2 – bad contact. Open the computer, disconnect everything you see and reconnect everything in place, making sure that everything is connected well. It is also advisable to wipe the contacts with alcohol, then wipe them dry and insert them back.
That's all, I hope I helped you, and you figured out your problem without going to the service center.
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