How to know if graphic card is damaged ? can someone plz tell me how would a person know if their graphic card is damaged? I've been having problems with my display and i don't know if its my gfx or not. My screen shows all these checkered textures and i cant play a single game without experiencing texture/color problems. I did an artifact scan using "ATI TOOL" and i saw that in the 3D display that the 'cube' had all these yellow checkered squares on them (LINK BELOW) http://img93.imageshack.us/my.php?image=clipimage0025fi.jpg plz help !