Disconnect the board from the power supply remove the battery and let it on Clear CMOS for a day.Then reinstall it and try to boot again ,maybe the back up BIOS wakes-up and kicks in.
Somewhere on the forum there is specified a method on how to force the back-up BIOS to kick in.
If that doesn t work after this stpes RMA the board , if still possible ,if not go to a PC shop and ask for help ,it should not be expensive to recover the BIOS.Anyway much cheaper than buying another mobo.