this morning I booted my mac-pro 2007 quad.cores and display stay in black and goes to power saving. I can screen sharing, when I log the Mac-PRO is in login window.
All works except display prefpane, detect displays doesn't do anything !!
So you can look up how to bake the card to possibly get more use out of it as many have done, or order ATI 5770.
Retrieving data ...