On Friday I posted a piece about a problem with vertical lines appearing on PowerBook G4 17-inch screens just as they got outside of their three-year AppleCare warranty.
The same situation exists as with the PowerBook G4s. Apple won't acknowledge the problem in iMacs and has a track record of deleting and/or locking posts on its message boards. A petition on the issue has over 1,000 signatures and states:
The defect causes vertical lines (cyan/yellow/pink) to appear cutting through the screen and multiplying as time goes by. Unfortunately, the problem starts to appear right after the end of the one year warranty.
One French user was succesful in taking Apple to court in France over vertical line defects in two iMacs and was able to receive a full refund on his machines.