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Computer turning off and on, on its own....

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while the voltages might look fine to you, they don't to the CPU or motherboard or memory,...

a +5 voltage that actuals are +4. 999 to +5.005 when it's supposed to be +5.148 is enough.. or the +12 that comes in on +11.814

if you overclock, you could be at the edge of what's stable... but my experience is, if the damn thing keeps randomly rebooting, a new power supply usually stops the problem.