What To Do When Your Computer Shuts Off During the Boot Process

Is your computer turning off by itself immediately or at some point before the operating system loads? If so, you may be facing anything from an electrical short to a serious hardware issue.

Since there are several reasons that your PC might be shutting off by itself during the boot process, it's important that you step through a logical troubleshooting process like the one I've described below.

Important: If your computer is in fact turning on and staying on, even if you don't see anything on screen, see my How to Fix a Computer That Won't Turn On for a more applicable troubleshooting guide.

Time Required: From minutes to hours depending on why the computer turns off so quickly after being turned on

Here's How:

1. Troubleshoot the cause of the beep code, assuming you're lucky enough to hear one. A beep code will give you a very good idea of exactly where to look for the cause of your computer turning off.
   If you don't fix the problem that way, you can always return here and continue troubleshooting with the more generic information below.

 2. Verify that the power supply voltage switch is set correctly. If the input voltage for thepower supply does not match    the correct setting for your country, your computer may not stay powered on.

Chances are your computer wouldn't power on at all if this switch is wrong but an incorrect power supply voltage might also cause your computer turn off by itself.

3. Check for causes of electrical shorts inside your computer. This is very often the cause of the problem when the computer powers on for a second or two but then powers off completely.

Important: It's very, very important that you spend the time necessary to inspect the inside of your computer for issues that can cause shorting. If you don't take the time to troubleshoot this possibility thoroughly you may end up missing a simple electrical short and instead performing costly hardware replacements later on for no good reason.

4. Test your power supply. Just because your computer came on for a few moments doesn't mean that the power supply unit in your computer is working properly. In my experience, the power supply tends to cause more problems than any other piece of hardware and is very often the cause of a computer turning off by itself.

Replace your power supply if it fails any of your tests.

Tip: If you do end up replacing the PSU, keep the computer plugged in for at least 5 minutes before you try powering it on. This gives time for the CMOSbattery to charge a little.

5. Test the power button on the front of your computer's case. If the power button is shorting out or even just sticking to the case, it might be the reason your computer is turning off by itself.

Replace the power button if it fails your testing or if you suspect it's not working properly.

6. Reseat everything inside of your computer. Reseating will reestablish all of the connections inside your computer which may have wiggled loose over time.

Try reseating the following and then see if your computer stays on:

• Reseat all internal data and power cables
• Reseat the memory modules
• Reseat any expansion cards

Note: Unplug and reattach your keyboard and mouse as well. There is little chance that either one is the cause of this problem but we shouldn't overlook them while we're reseating everything else.

7. Reseat the CPU only if you suspect that it might have come loose or might not have been installed properly.

Note: I call this out separately only because the chance of a CPU coming loose is very slim and because installing one is a sensitive task. This isn't a big concern if you're careful so don't worry!

8. Start your PC with essential hardware only. The purpose here is to remove as much hardware as possible while still maintaining your computer's ability to power on.

• If your computer turns on, and stays on, with essential hardware only, proceed to Step 9.
• If your computer continues to turn off by itself, proceed to Step 10.

Important: This troubleshooting step is easy enough for anyone to complete, takes no special tools, and could give a lot of very valuable information. This isn't a step to skip if, after all the steps above, your computer is still shutting off by itself.

9. Reinstall each piece of nonessential hardware, one component at a time, testing your computer after each installation.

Since your PC powered on with only the essential hardware installed, those components are working properly. This means that one of the devices you removed is causing your computer to turn off by itself. By installing each device back into your computer and testing after each installation, you'll eventually find the hardware that caused your problem.

Replace the faulty hardware once you've identified it. These Hardware Installation Videosmight come in handy as you're reinstalling your hardware.

10. Test your PC using a Power On Self Test card. If your computer continues to power off by itself with nothing but essential PC hardware installed, a POST card will help identify which piece of remaining hardware is to blame.

If you don't already own and are unwilling to purchase a POST card, skip to Step 

11. Replace each piece of essential hardware in your computer with a "known good" identical or equivalent spare piece of hardware, one component at a time, to determine which piece of hardware is causing your computer to shut off automatically. Test after each hardware replacement to determine which device is faulty.

Note: Most normal computer users don't have a collection of working spare computer parts at their disposals. My advice is to revisit Step 10. A POST card is not expensive and is a much more reasonable approach than stocking spare computer parts.

Finally, if all else fails, you'll likely need to seek professional help from a computer repair service or from your computer manufacturer's technical support.

Unfortunately, if you're without a POST card and also without spare parts to swap in and out, you're left not knowing which piece of your essential computer hardware is faulty. In these cases you have little option than to rely on individuals or companies that do have these resources.

Note: See the last tip below for information on requesting more help.

Tips:

1. Are you troubleshooting this issue on a computer that you've just built? If so, triple check your configuration! There is a significantly greater chance that your computer is turning off by itself due to a misconfiguration and not an actual hardware failure.

    2. Did I miss a troubleshooting step that helped you (or might help someone else) fix a 

    computer that's turning off by itself during the boot process? Let me know and I'd be happy to include the

    information here .

   3. Is your computer still shutting off automatically even after following the troubleshooting 

    above? See Get More Help for information about contacting me on social networks or via 

    email, posting on tech support forums, and more. Be sure to tell me what you've already done to try to fix the    problem.

Many people are faced with everyday computer problems that are easy to fix, but are unable to diagnose the actual problem. While there are many problems a computer will be faced with, this article will tell you where to look for common problems.

steps

1

Check the POST. POST stands for Power On Self Test. This is generally the first or second thing that appears on a computer after turning on the power. This appears before the operating system begins to load. The POST will display any problems found with hardware that makes the computer unable to boot, POST may also display problems with hardware that allow the computer to boot, but not operate at its full capacity during 

1. 2
   Notice the load time of the OS (operating system). A longer than usual load time may indicate seek errors (or other errors) in the hard drive.

1. 3
   Notice any graphics problems once the OS has loaded. Reduced graphics may indicate driver failures or hardware failures with graphic cards.
2. 4
   Perform an auditory test. An auditory test is an unorthodox, but still effective way of judging how hard a computer is working. With the computer on and running, play any decent length audio file (usually above 30 secs). If the audio is choppy or slow, it usually means that the processor is working at an elevated level, or there is not enough RAM to run all programs loading. Changing the startup sound is a great way to apply this test. Another issue associated with choppy sounds is PIO (Programmed Input/Output) Mode. This affects how the hard drive reads and writes data from a drive. Switching to DMA allows for faster reads and writes, and can sometimes repair choppy audio.

1. 5
   Check any newly installed hardware. Many operating systems, especially Windows, can conflict with new drivers. The driver may be badly written, or it may conflict with another process. Windows will usually notify you about devices that are causing a problem, or have a problem. To check this use the Device Manager, this can be accessed by entering the Control Panel, clicking the System icon, clicking the Hardwaretab, and clicking on Device Manager. Use this to check and arrange the properties of hardware.

1. 6
   Check any newly installed software. Software may require more resources than the system can provide. Chances are that if a problem begins after software starts, the software is causing it. If the problem appears directly upon startup, it may be caused by software that starts automatically on boot.

1. 7
   Check RAM and CPU consumption. A common problem is a choppy or sluggish system. If a system is choppy it is good practice to see if a program is consuming more resources than the computer can provide. An easy way to check this is to use the Task Manager, right click on the taskbar select Task Manager, and click the Processestab. The CPU column contains a number that indicates the percentage of CPU the process is consuming. The Mem Usage column indicates how much memory a process is consuming.
3. 8
   Listen to the computer, if the hard drive is scratching or making loud noises, shut off the computer and have a professional diagnose the hard drive. Listen to the CPU fan, this comes on a high speed when the CPU is working hard, and can tell you when the computer is working beyond its capacity.
4. 9
   Run a virus and malware scan. Performance problems can be caused by malware on the computer. Running a virus scan can unearth any problems. Use a commonly updated virus scanner (such as Norton Antivirus or Avast! Antivirus) and a commonly updated malware scanner (such as Spybot Search & Destroy).
5. 10
   Check for the problem in safe mode. As a last ditch effort, check the problem in safe mode. To enter safe mode, tap F8 repeatedly during POST (this works on most systems). If the problem persists in safe mode, it is a fair bet that the operating system itself is to blame.