- Mar 25, 2014
- i7 3770k
- Classic Mac
- Mobile Phone
Pressing F12 to select a boot device has nothing to do with how you've set up your BIOS. Are you certain you have AHCI set? Are you running a UEFI or standard Award BIOS? Either way, I'm 99.9% sure you have to specifically set AHCI in either.
I'm running a UEFI bios. I think I have it set properly but maybe you can spot something that might be off: