One of my friends had a fan go on his GF256DDR
After a couple of days, he started to get lines go across the screen, and any black/dark colours would streak across the whole display, made reading text really bad. If you've ever seen ghosting on a TV with black text on white background, or vice-versa...take that image, and stretch it across the whole screen.
It got REALLY, so much more horrible to read after about a week!
Confused