It's probably a hardware issue, but I was hoping that someone might know of other options to try. My iMac G5 (the revision just before the built-in iSight was introduced) has developed an annoying pattern of short/wide rectangles in a pinkish hue across the screen. I've followed Apple's instructions to ensure that the logic board hasn't failed (by resetting the SMU and watching the internal LEDs light-up). I suspect either the LCD or video card has failed. Below are two screen shots, one taken by my iPhone which exhibits the problem and a snapshot taking from the faulty iMac which looks fine.