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I have 3 year old computer that shuts down automatically after 15 minutes. Since all the fans are working, I don't suspect a heat problem

So what else could cause my computer to shutdown like this?

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please have a look at my edit and try to strive for some better English next time. I can't go and edit every question you ask. –  Ivo Flipse Jan 22 '11 at 15:59
    
thanks for the edit –  Gold Jan 22 '11 at 16:07
    
Might be a virus problem. Google for a virus that shuts down the computer. –  Akshey Jan 22 '11 at 16:44
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You cannot just assume that it is NOT a heat issue. Just because you hear a fan whirl. Heat buildup could be caused by dust clogging a fan, or building up around cooling fins (video cards, etc).

Please update what operating system you are running. In many cases, having a look @ (windows) event logs will give you an idea WHY something shut down. IT will log those things for you to review, sometimes it could be a failing video driver and it notes something like ati.dll failed to blah blah which hints at it being an ati video card issue (yes ati/amd).

Update your question and post more details, otherwise people will just guess.

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