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Computer shuts down randomly, startup freezes, works later

Discussion in 'Hardware' started by vanten, Jan 22, 2011.

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  1. vanten

    vanten Thread Starter

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    Hi,

    My computer randomly shuts itself off. It can happen after 15 minutes or up to 12 hours.

    When I turn it on again it always freezes when the Windows logo appears, (Win7 and the part where the four dots become the logo).

    If I wait for about 10 minutes, the computer will start up again, and we're back at the beginning again.

    (Edit: A new symphtom is that sometimes when I reboot, without it crashing, it freezes on "Starting Windows" as well.)

    Any ideas?


    /Svante Paulsson
     
  2. TerryNet

    TerryNet Moderator

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    For this kind of problem my first thought is always the power supply failing. Can also be memory or hard drive.

    What about Safe Mode? Can you boot into that and run reliably?
     
  3. vanten

    vanten Thread Starter

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    I haven't tried safe mode yet.

    Apparently it likes to shut down when I stream videos from my browser. I'm trying Speedfan now to see the different temperature changes, problem is that I don't see when it crashes =).

    I don't think it's the HD since I installed another Win7 on the other HD and it's the same problem.

    How do I know if the power supply is failing?



    A new symphtom is that sometimes when I reboot, without it crashing, it freezes on "Starting Windows" as well.

    And apparently I think it's crashing when I watch streamed videos from my browser.
     
  4. TerryNet

    TerryNet Moderator

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    The best way I know of is to try another one. And, yes, I understand that's not very convenient for most of us because we don't have a spare one sitting around.

    Right click on Computer - Properties - Advanced system settings - Advanced tab - Startup and Recovery Settings... - unselect "Automatically restart." If it still shuts off (or restarts) as if you had pulled the plug that is a pretty good indication of power failure.

    I twice had a power supply failure on a Windows 98SE desktop and both times that was one of the symptoms.
     
  5. vanten

    vanten Thread Starter

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    Thanks for your response!

    Apparently my CPU:s are overheated according to a program, all four. The fans are still moving though. Can it still be a power supply problem or do I need a new processor?
     
  6. TerryNet

    TerryNet Moderator

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    I'm going to move your thread to hardware (from Windows 7), where you will probably get a lot more (and better) help.

    Make sure the heat sink does not have crud built up on it, make the dust bunnies look for another home, clean the fan blades if needed and make sure the vents are clear.

    A failing power supply is one possible cause of a device overheating.
     
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