Pressing F12 doesn't let me into the boot device screen???

[secondfloor]

I'm installing 10.8.3 on a GA-X58A-UD3R. I had previously finished the installation of mountain lion and was trying to figure out which DSDT I needed for my motherboard (2.0FF? 2.0FE?) and read on these forums that the letters refer to the BIOS version and can be found by booting into BIOS. Unfortunately, when I restarted, pressing F12 doesn't let me choose boot device, and pressing delete doesn't let me into BIOS. It just hangs at "Verifying DMI Pool Data............" I've checked my keyboard is working. Not sure what else to try???

 

[beelzebozo]

Does your keyboard have a "FN" key? If so, you probably have to press it at the same time.