Hi guys I have a problem. I chucked in a XFX 6870 into my Mac Pro 1,1. It's fast and works fine as described elsewhere in this forum, however because there is no boot screen I cannot see what I'm booting into. I cannot install Bootcamp onto Windows 7 because it blue screens everytime so i can't switch OS from within there. I use the OPTION key during boot up but I'm just guessing what I'm actually selecting; here's the problem, when I think I've selected OSX the MP just hangs and because I have no screen display I cannot see what the issue is. So my question is, how are other users without a boot screen switching from one OS to the other?