On my second Maximus and have the same issue as the first one I rma'd

Getting...

CMOS Ckecksum Bad
Press F1 to run setup
Press F2 to load default

Hitting F1 or F2, clearing cmos and removing battery has no affect and cannot get into bios at all

Swapped out both sticks of ram, ran one stick and both, no affect

Hardware in my signature

Anyone know what's wrong ?

Thanks in advance