How To Resolve Windows Restarts Without Warning

Step 1 : Software Issue or Error 

Below are the steps on how this feature can be disabled and enabled in Windows XP, Vista, 7, 8 and 10.

•    From the Desktop, right-click on My Computer.

•    Click the Properties option.

•    In the System Properties window, click the Advanced tab or the Advanced system settings link.

•    In Advanced, click the Settings button under Startup and Recovery.

•    In the Startup and Recovery window, uncheck the Automatically restart check box.

•    Click OK.

Step 2 : Hardware issue or Error

        Any failing hardware component in your computer could cause your computer to unexpectedly generate an error or reboot without warning. If you have recently attempted to add a new hardware device, remove that device to make sure it is not causing your issues.

Make sure you are not encountering any hardware conflicts by viewing Device Manager for errors.

Step 3 : Computer virus

Some computer viruses, such as the blaster virus, are designed to reboot your computer without warning. Usually these viruses make the computer reboot every 5, 10, 15 or 30 minutes after the computer has started up.

If you believe your computer has a virus, make sure an antivirus program is installed in your computer and that the virus scanner definitions are up to date.

Step 4 : Issue with Operating System

If after following each of the recommendations above, your computer still continues to reboot, you are likely experiencing an issue with the Microsoft Windows operating system.

To help determine if this is the case, try the steps below.

•    Reboot the computer and enter CMOS setup when the computer begins to boot up.

•    After you have loaded the computer into the CMOS setup, let the computer idle for a few minutes.

Step 5 : Heat Related Issue

Most computers today are designed to turn off or automatically reboot if the computer processor, video card, or other devices in the computer get too hot. If you have heard any abnormal noises coming from your computer recently, such as a high squealing, this could indicate a fan may be failing in your computer, resulting in heat buildup and overheating of hardware components.

First, verify the fan on the power supply is working by examining the back of the computer and seeing if the fan is moving in general, as well as moving fast and smoothly (e.g. not wobbling or scraping against the insides of the power supply). For all other fans in the computer, you need to open the computer and verify all fans are working (e.g. processor fan, video card fan, and case fans).