Computer auto-restarting

Hello, my computer is restarting randomly. My guess is something is overheating and is automatically turning off because it restarts later in the day (especially warmer days), and restarts in succession (when turned back on again it restarts a few minutes later).

I've run a gpu strain ( and cpu strain ( and memory check with three passes ( all without yielding the problem.

My system is four years old, and only recently been having this issue. The timing is also inline with installing new ATI drivers (running an ATI HD 4870).

Thanks for your help!
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More about computer auto restarting
  1. restarts and in shuts down windows and reboots?

    or restarts as in someone pulled the plug from the wall and the power is gone ?
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