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My computer stalls about 5 minutes after a cold boot.

I let it warm up, restart it and then it'll work fine until next cold boot.

Issue happens in XP, Win Vista and Win 7 (even happened during an os install). Haven't tried a linux on it, but its a safe bet that its not a software issue.

Previously in the same machine I had a bad RAM that manifest as errors while installing software, and crashes during games.

Not Overclocked.

I'm assuming its either the power supply stability or a bad cap on the motherboard, how can I diagnose which it is?

Thanks

Steven

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The cheapest solution would replace the power supply. If its bad then you solve the problem, if the problem is not solved, then you have in theory a better power supply. If its a bad cap in the motherboard your only real solution to to replace the motherboard. –  Ramhound Jan 30 '12 at 20:24
    
possible duplicate of How can I diagnose a faulty power supply? –  techie007 Jan 30 '12 at 20:27
    
So both of you believe that power supply is more likely the issue? –  stevenrcfox Jan 30 '12 at 21:03
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