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