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sound smore like a software problem, how does it turn off, do you see it shutdown, or does it just click off,
does safe mode work ? if so boot it into that and leave it for a bit, if it doesnt turn off its, likely software, if the PSU is that bad, even leaving it at the very first OS selection screen or in the bios settings would likely caiuse it to repeat it.
If it doesn't do it in safe mode, try removing norton or doing a system restore if its got XP.
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