Just to update this thread to the fact that the 10.7.5 11G63 build from October 4, 2012 will work with a non-EFI / generic PC Kepler graphics card in a Mac Pro 1,1 . If you're attempting a clean install, I haven't found a solution yet. The installer displays and actually drives a dual monitor setup during the installation process. Booting from a USB would require access to Startup Manager with the Option key, but you aren't able to see it with a non-EFI card. The best option seems to be a burned DVD and then holding the C key, but my original SuperDrive is not happy with a dual layer disc. The 10.7.5 11G63 build comes in at 4.72, just a bit more than a single layer 4.7GB disc. I need to figure out how to get 11G63 smaller and then burn a 4.7 disc. It seems to be possible with Mountain Lion, with all the articles out there, on decreasing the image size. The problem is most people have moved on to 10.8 and aren't trying to tinker around with 10.7.5, which came out two months ago.
