I have a first gen Mac Pro. (2.66, 4 core, 20" cinema display, 4 years old, Leopard, all updates) Just upgraded from 2GB to 4GB Memory and added a new 1TB western digital drive (fresh install of Leopard on the drive). Now my graphics card seems to be dying on me. (ATI X1900) I'm getting blue and yellow shadows randomly on the display while certain areas seem to be "sticking" while I work. Also the entire display has a tendency to freeze and I have to hard restart. I have air-can sprayed the entire machine dust free but am still having the issue. Any help/suggestions would be greatly appreciated.