Just had the same issue on this same motherboard. I reverted back to my old bios with the backup I made and it works again. The newest bios is indeed the problem! Do not update to 2009-09-11 A76GM911.BSS
Arggh! I have this same issue. Was working fine with my old/original BIOS, updated and reformatted (losing my BIOS backup). Any chance I could get a copy of the BIOS that worked on rapidshare/something or email?