ATI Radeon X1900xt on Mac Pro 1,1

Hello,

When I start up initially, I get no video input on monitor. I can load into windows through bootcamp blindly and display comes on and then I can access OS X thru windows and boot that way. I have done every possible check and have no answer as of yet(including talking to the "genius" at the local mac store who was absolutely no help).

What is the computer looking for on initial start up with OS x that windows can access and turn on yet OS x doesn't? (EFI is good, power supply is good, RAM is all good, monitor like i said works on Windows start up?
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  1. One more thing, I have had a black out screen for about two weeks any help would be appreciated!!!!!!
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