Looks like my X1900 XT might have crapped out. My desktop is pixilated with small white squares. If I open a window with a white backround that window has small black squares all over it. If I move the window it becomes so pixilated you can not even read it. This is on my 30"ACD. I removed the ACD and hooked up a 20" Dell LCD, same problem. Called Applecare, we ran the hardware test, but nothing came up. We tried a couple of things and now they have me doing a erase and install. If this doesn't work they said they would need to send me a new card.