Question Pc turns on and off no display error 72

Aug 6, 2019
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I have the p67h2-a2 board with i5 2500k. I edited some things in bios and it reset then the display wouldn’t turn on and it keeps resetting. I get an error code 72 which is south bridge initialization or something like that. I tried removing ram and reseating the gpu in both spots but nothing worked.