Did you disable the Keep DMI Data when you updated the BIOS?
Try clearing the CMOS completely by:
Remove the power cable from the mains supply and then press the power switch on the case for a few seconds just to drain any residual energy in the PSU capacitors.
Once done remove the motherboard battery for at least ten minutes before replacing it.
Next plug back into the mains supply and boot.
You will now need to enter the BIOS by pressing DEL and load Opimised BIOS Defaults.
Make any other changes to the BIOS settings to suit your self and then press F10 to save and exit.
