My aging i5 -2500k build recently had the gpu go out in it, at least that was my original thinking.
it was a bfg gtx280, i had an old 8400gs card to test with, it would not work in the top pciex…

Asrock P67 ex4 odd issue “need help”

Source: [H]ardOCP – Asrock P67 ex4 odd issue “need help”