Dark Jedi

Why are you stuck on this power supply thing, Dai? Am I missing something? The PS tests good and works in another machine, and another similar PS works in this machine. Nothing else has changed in the last six months, no new hardware. The only new software was AVG Antivirus a few months ago. I have eliminated the power supply as the cause of this problem (unless I am missing something). I do realize that there are bigger PSUs out there, but there has always been plenty of power to run this older system and there is no lack of power.

I am beginning to lean heavily toward the mobo on this one. Before I ask the boss to pay for one (likely a cheapie from TigerDirect or the like), any other ideas I should try (besides what I have already tried)? Thanks.