Hey,
My bro's pc was first built and it failed to pass POST. After an hour of checking the PC over I managed to get it to boot fine. Things were good for a week when the same thing happened. Failed to pass POST.
Put my mobo + cpu which had no faults previously into his pc and vice versa. Only difference between the 2 pc's was I have a 750W corsair and he had a 620W more than adeqate for his system.
Everything was fine and his PC failed to POST again, this time it was with my Mobo and not his. It has been like this now for a week and even afeter swapping Mobos back. Putting in a new 750W Corsair PSU and no joy at all. Dead Mobo.
Would it be advisable to send the 620W PSU to yourselves for testing as I am sure that this has to have been killed by the PSU as this was the only difference in Spec. Everything was running at stock.
Ta