PC turns itself on and off

  vally 19:41 04 Jun 2008

If I have just the M/board wired up to the power supply(nothing else) the problem still exists, after half a minute or so it will turn itself off and then back on fairly soon after, I think this is a temperature prob, tried another PSU(no change) SO is the processor(Intel Pentium dual core) doing it or the M/board , I don't have spares of the same kind and I don't have a spare fan either
Is it a case of "trial and error" or is it a known prob, my guess is the processor is the prob but would love to have other opinions

  Fruit Bat /\0/\ 19:47 04 Jun 2008

Is fan turning on processor?

have you disturbed heatsink?

new thermal paste added?

  vally 20:02 04 Jun 2008

M/board came as bundle-with fan cpu and memory- fan runs all the time, nothing disturbed

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