boot device

Hi everyone, this is my build: MSI Z77A-G45 i7 3770k GTX680 16GB RAM 1TB HDD 750w PSU I'm having some problems flashing my motherboard via the BIOS in M-Flash using http://biosrepo.wordpress.com/msi/ on a FAT 32 USB, I received a black screen that said "Reboot and Select proper Boot device or...

Hi! I just built my first Hackintosh, and the install went smoothly. I have a Gigabyte Z77 MB, and an Intel i5 3570K CPU. Anyways, in my UEFI BIOS, before I went through trying to fix the grey screen at startup issue, there were two options for my WD Green 2TB Hard Drive: UEFI and P4 (P4 is just...