First try clear CMOS if that does not work do this. Your motherboard has Flash BIOS Button.Download the correct BIOS for the motherboard and CPU and flash the BIOS.
Clear CMOS using the battery method
Turn off all peripheral devices connected to the computer.
Disconnect the power cord from the AC power source.
Remove the computer cover.
Find the battery on the board.
Remove the battery:
Wait 1–5 minutes, then reconnect the battery.
Press power button to discharge
Put the computer cover back on.