Random reebots

Hello. Im experiencing random reebots with my computer, the whole system just restarts randomly. Really annoying when Im playing online etc. How can I find out whats wrong? I dont get any errormessages, nothing. The computer just starts normally again, and I'm getting no info what so ever. I have had the same problem before, with windows xp, but there atleast I got a bluescreen so I found out what was wrong, and sent my computer to service, changing my memorystick which was disfunctional.

Would appreaciate any help I can get (sorry about bad english).

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