Windows computer restarts without warning

If your Windows computer restarts or reboots without warning automatically here are a few suggestions which may help you identify and fix the problem. There are several reasons that could cause this to happen. The problem could any! It could be failure of some hardware component, over-heating, Windows Update or a Stop Error.

Computer restarts automatically without warning

You will have to identify your problem and then see which of the following scenarios applies to you. Do you get to see a Blue Screen? Does your computer overheat? Updated your Driver recently? Installed some Windows Updates? Once you can identify the probable cause, things could be a bit easier.

Reboot after Blue Screen or Stop Error

To prevent a software or driver issue from restarting your computer repeatedly after a Stop Error, do the following. You need to do this so that you can read the error code, which in turn can help you troubleshoot the issue.

computer restarts without warning

Using the WinX Menu of Windows 8.1, open System. Next click on Advanced system settings > Advanced tab > Startup and Recovery > Settings.

Uncheck the Automatically restart box. Click Apply / OK and Exit.

Now if your Windows were to crash due to a Stop Error, it will not restart the computer but will display the error message, which can help you troubleshoot the Blue Screen.

This post on Windows Stop Errors or Blue Screens Guide and Resources will help you troubleshoot the issue.

Rebooting due to Hardware failure

Hardware failure or system instability can cause the computer to reboot automatically. The problem could be the RAM, Hard Drive, Power Supply, Graphic Card or External devices: – or it could be an overheating or BIOS issue.

This post will help you if your computer freezes or reboots due to Hardware issues.

Restarting after Windows Update every time

If your computer gets into an endless reboot loop, try to get into Safe Mode or access Advanced Boot Options. Here you can open a command prompt windows or system restore or perform an Automatic Repair. Windows 7 users may want to consider repairing Windows 7.

See this post if your Windows is stuck in a reboot loop after Windows Update. and this one if you receive a Your PC will automatically restart in one minute message in Windows 10.

If you wish, you can also prevent Windows 8 from restarting after Windows Updates by using the Group Policy or Registry Editor.

Driver problems causing reboots

If you recently updated your device drivers and now find that your Windows restarts without warning, you might want to troubleshoot your Driver problems or consider rolling back your driver to the earlier version.

This post will show you how to Uninstall, Disable, Roll Back, Update Device Drivers.

Scan your Windows for malware

Malware or virus infection could also be a possible cause for your computer restarts. Deep scan your computer with your antivirus software. You may want to also use a second-opinion on-demand antivirus software to scan your Windows, just to be doubly sure.

I hope something here helps you. If you have any inputs to add, please do so in the comments section.

Posted by on , in Category Windows with Tags
Anand Khanse aka HappyAndyK is an end-user Windows enthusiast, a Microsoft MVP in Windows, since 2006, and the Admin of Please read the entire post & the comments first, create a System Restore Point before making any changes to your system & be careful about any 3rd-party offers while installing freeware.


  1. Seath

    This is good article, but how do you identify the problem?
    I have build my own custom computer few months back, its my main workstation and my home server. I never shut it of or put it to sleep, its always on. It happened about 4 times in those months that in the morning the computer was restarted sometimes in the night. I know its not update. So how do you identify the problem?

  2. I agree – that is indeed the most important and most difficult question in such scenarios. It does become difficult for others to say – you are the best person to find that out. That is why my first para reads “You will have to identify your problem and then see which of the following scenarios applies to you. Do you get to see a Blue Screen? Does your computer overheat? Updated your Driver recently? Installed some Windows Updates? Once you can identify the probable cause, things could be abit easier.”

  3. Windows Event logs should help you narrow down and problems. If they are serious, they will have a red X, and a yellow warning triangle for less critical problems.

  4. Good write up! This is a common occurrence and if it isn’t produced by some serious problem, it can cause some serious problems. I have experienced data loss myself due to an unexpected reboot and have had to give other people the same bad news. This coveres the topic well.

  5. Garth Notestine

    I read this article with a total open mind….my system just shuts down, I thought overheating….processor fans all good and everything else…called my tech support, they said possibly power supply, bought a new one increased my old one from a 300 W to a 650W same problem, they said it must be software, I low level formatted everything….seemed to solve the problem, just this morning I upgraded my windows 8 to 8.1 and BOOM starts shutting down again…just don’t know what to do.

  6. Nikolaj Vorobljev

    having a pc issue.. when i play something on chrome or playing a game my pc resets by itself does anyone know how to fix it?

  7. Nikolaj Vorobljev

    Not problem with overheating or with hard disc..

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