Ordinarily I would have said that your motherboard bios ROM was toast, but after a little bit of research, I discovered that might not be the case.
Asus has a utility/feature called Crash Free Bios2 which is apparently a Bios Auto Recovery Procedure. You can read about it here:
http://www.asus.com/support/english/...os2/index.aspx
According to their web site, your motherboard supports, or will work with, this feature.
Base that on what I read here:
http://usa.asus.com/products/mb/sock...0/overview.htm
Suggest you read the first linked page and follow the instructions there. You may be able to recover after all.... Good luck, and let us know what happens.