I just purchased a 15 in. iMac G4 1GhZ the last of the iMac G4's The computer runs fine and has a line of stuck green pixels on the screen cant really notice but.. when the iMac wakes from sleep the screen is scrambled like a T.V pulling in a bad channel anybody have a clue on how to fix this?? I got a good deal on the iMac could this be why?