So i have a mac Pro octo from May 2007. I upgraded to the 8800GT when they came out and not have any problems since. Today I encountered some problems with my hard drive and am trying to boot from either my Mac Pro Install disc or my Leopard Install disc and get an error everytime. When I try and boot from the disc it gives me an error and tells me i need to reboot. I have found out through the apple discussion forums that Leopard Discs before 10.5.2 do not have the drivers for the 8800GT, and therefore will not let you boot. What am I to do here. Is there any way I can get a newer leopard install disc? It seems I am going to have to reinstall an Ati X1900 to get my own install discs to work. This is really annoying to me, this is an awful design flaw. How do they expect you to upgrade your mac pro and not have problems like this.