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I think your right. The card I had was for a G5. I ordered a different one that they say is compatible -ATI Radeon HD 2600 XT 256MB PCI Express Video Card I'll keep you posted. Thanks for your help & insight. Rizz

It wasn't booting up at all until I replaced the riser board. It booted up with video once. Then a day later the video was gone. So I used a card from a different Mac Pro and it worked. So I thought I would just buy a new one since I had to put that other card back in the other Mac Pro. So...

I just put a new video card in my Mac Pro. When I start it up I hear the chime and I get a solid white light on the front. I can hear the drives spinning and it seems to be booting up, however, I get no video. I have tried the other PCIE slot but still nothing. Replaced the riser board that...