Some quick background - my friends mac pro 2008 model had it's gfx card die a while back, so we replaced it with a XFX 6870 1gb graphics card. He mainly uses windows and never boots into OSX - so when the card installed fine he didnt make a fuss over it and left it at that. Today he needed to boot into OSX to use final cut pro - and noticed that the boot menu never came up with holding down the option key. He selected 'boot into OSX on restart' - but that didnt improve anything, and now he cannot boot back into windows 7 either. I am assuming this is because the XFX 6870 does not support EFI & bootcamp - hence we cannot see any video out - and the version of snow leopard that is on there also doesnt support the 6870. I noticed this thread: http://forums.macrumors.com/showthread.php?t=1325488 But could not find any links to download to get the firmware that slughead made. Are there any other options at this point? He doesnt want to lose the data on his osx / windows partitions. At the moment no combination of pressing different startup keys seems to make a difference. Would upgrading to mountain lion work? Thanks for any help / advice.