Hello. I have a problem booting from my DVD/CD drive with my (unflashed) PC version XFX ATI Radeon 5770 card. I'm having some problems with one of my internal hard disks and want to run a utility to fix it. My Mac Pro and the 5770 card work fine once it's booted to the login screen, but I can't seem to force it to boot from my DiskWarrior CD or Snow Leopard DVD. During the boot process I don't ever see the Apple grey screen or logo. This is normal with PC versions of the ATI cards. So I've tried timing the pressing of the 'C' keep or the Option key during startup without success. My Mac always just continues booting normally and ignores the CD or DVD in the drive. I'm wondering if my card needs the Apple EFI code to be part of the 5770 BIOS in order to boot from a CD/DVD? Alternatively, can I safely force the CD/DVD drive to be the boot drive using System Preferences/Startup Disk?