I am working on a G4. It's running Mac OS X 10.4.11 and is used a Media 100 editing system. My graphics card has been replaced but doesn't work properly, the resolution can't go above 1280x1024 and I know the monitor works fine. The card that is in it now is a ATI Rage 128 Pro. I was told this is the only one that can work with the G4. I don't know much about the G4's, is there any other graphics card I can use? Can't any AGP card work that is compatible for Mac's? I tried installing the latest drivers from ATI but that didn't work.