black & white squares? video card bad?

i have PC x800gto and the only game i play is world of warcraft, and after about 30mins in game, the screen will go crazy with these black and white squares everywhere, and i cant see anything, the ATI GPU crash thing doesnt come up or doesnt restart. it only does it when i play wow, i tried different drivers newest from ati, and old one, and ones on the disk all do the same thing, i cleaned out the case of dust. any idea? :?: thanks
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  1. it's probably overheating. get a better ventilated case and clean the video card as well. video cards can build up just as much dust as anything else.

    it's possible the card is bad... but heat is a more likely explanation.
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