Hello everyone. First of all I want to say a big grats to this forum and its members. You have been a big help in the past few days for me. Specially Cindori's Golden Guide http://forums.macrumors.com/showthread.php?t=877441 That was a big help to me since I'm totally new to this. I get what I need to do I just can't do it... I've been trying to flash my XFX Ati HD5770 on Mac Pro 2008. Problem is I'm stuck trying to boot from a CD to flash the card. Forum member Shapa was kind enough to help me. I was told and already stumbled upon a thread, to use http://www.ultimatebootcd.com/. On that link there are tons of utilities to download and I had no idea what to download so I just googled "UBCD V5.0" and I downloaded an ISO image. I burned that to a CD. No luck. If I press the 'option' key on bootup all I get is my Mac Drive and the bootcamp drive. No CD. To add to that I know that when I put the HD5770 in the computer I won't even be able to use the 'option' key since the card won't load on mac. So far all I've done with the HD5770 was to test it on Windows (bootcamp) Works fine of course. I have the old X1900 back in now. Just to test the BOOT CD I've also tried to select under Leopard the CD as Startup Disk. When I boot I end up with is the Mac logo flickering with a Traffic STOP SIGN (circle with line across not actually a Stop sign but you know what I mean). Also Shapa mentioned keeping "c" pressed on bootup. No luck there too. Grey screen forever. Nothing happens. I already have the vanilla saphire rom and the Mac 5770 rom which has been posted recently. Ready to flash the damn card. Unsure of which one to use but that's the least of my problems at this point. I've done plenty of research and nothing seems to be working for me and what makes me insane is that it's probably so simple it hurts. Anyway thanks in advance. Any help is appreciated.