I agree on the PS. Easy test - next time it shuts down - have him pull the power cable off the psu - even if its till running. If he can count to 30 - plug it back in and turn the pc back on and it runs first time every time - its definitely the PS. Its a test I suggest trying 2-3 times just to confirm.
The reasoning here is that it sounds like the ps is no longer providing full power as it should - the mb goes into a low power state - then gets stuck in it. Pulling the incoming power lets the ps drain down entirely - so when he plugs in and repowers - it runs for a while again before failing.
There is the possibility of it being the mb - but right now the ps is definitely the most likely culprit.
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Captain Haplo
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