I'd say the PWM is blown in these mobos, or some caps have been underrated (seen some cases where standby cap is too weak, Leak/dryed).
Those part costs 1-5$, pretty little price for 500$ dead mobo...

Anyways, I'd like to recommend these Supermicro mobos, rock solid can't rly broke these things or make em crash unless by OS error or overclocks :P