I had a similar issue with my GeForce I DDR card... I ran my machine 24 hours a day since I bought the damn thing, and one day I unlocked my workstation and everything was COMPLETELY blurry... it was insane. I called Sony the next day cause I thought it was my 21" monitor that went out... which would suck to have to UPS back to them for repair.
Opened up the box and it turned out the fan on the videocard stopped, cause it was all clogged with dust. I've been thinking perhaps a HEPA filtered air filter in my room might help with the dust issue.
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