I had this same problem. The board seemed to run fine for 2 days, then set the bios up for a minor overclock with the ram, and the system would not boot back up. I tried everything, reset cmos, remove battery, jumpers, and left it unpowered for 2 days. I took all my components to a local computer store, and had them tested, and they agreed it was the board. I rma'd it, and so far it's been great. I think it was bios 12/18 on the bad one. Don't give up, I had to go through 3 DFI boards till I get a good one. Don't give up hope, once you go dfi, you can't go back...