Another culprit, other than the cpu or motherboard may be your power supply. Ideally you should check the bios to see if your 3.3, 5, and 12 V rails are close to spec, possibly you could disconnect everything but the bare essentials from the power supply to see if you could get to the bios (especially if it is a power issue).
Have you recently swapped hardware into/out of the machine?
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