My CPU suddenly turns off, what might be the cause?

I started mi PC and after several hours it turns itself off amd stays in a black mode where the only thing to do is press the on/off btn to turn it off for good.
Its an Intel pentium 4 running with Windows 7 and 1Gb Ram.
Any help please?
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  1. Have you checked temperatures ? can it pass OCCT torture tests ?
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