Here is a picture of my problem: http://imgur.com/gRI3V.jpg . These weird pixels only appear when I am playing WoW. They appear on my desktop as you saw, and in WoW. When I exit the game the pixels return to normal. Is it possible I am putting too much pressure on my GPU. My Mac Mini's video card is the 320M, it has 4GB of RAM and a 2.66GHz CPU. Is it possible my GPU is defective? 
I can also look up the model of my monitor if necessary. I would love if one of you were able to diagnose my problem, thanks in advance.
I can also look up the model of my monitor if necessary. I would love if one of you were able to diagnose my problem, thanks in advance.