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My computer suddenly powers off and restarts. It can happen at any time. Sometimes it occurs one minute after booting and others after hours or days or even a week.

I have checked my ram, hard disks, and OS and have found nothing. I have coolermaster650w smps, core i7, rampage3gene main board, AMD HD5770gpu, 8GB RAM.

What else can I do / check for?

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Have you checked for heating problems? – terdon Sep 16 '12 at 18:32

Random power offs like that can often be due to a bad or insufficient power supply. If you have another power supply handy try using it. If you have a different, preferably older, graphics card, put it in and see if the computer still reboots. Modern 3D graphics cards draw a lot of power.

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