i have just bought a second hand GTX 285 Mac Edition. The card looks in good condition but I'm having major issues trying to get my mac to recognise it. I have a 2009 mac pro which has the "08" firmware. The problem i have is that the card spins the fan up full speed and and no video is displayed (black screen) when booting the machine. I have read the reviews of this card and when the card was released there was an issue where a black screen was displayed if you did not install the drivers before installing the card. I have tried to install the drivers but my system reports that no updates are necessary. I can place my original GT card in slot two and boot with that and when i look in the system profiler PCI slot one does not show up! I have tried on my existing system disk and also with a fresh install but to no joy :-( Has anyone else experience this or do i just have a dead card?