I have one and it fades really badly. Do this simple test and post your results. The best test that most of the iMacs (20" Al) will fail on is if you open iTunes open an internet radio station. Or something to show the blue and white dividing bars. Now drag the iTunes window from the top of the screen to the bottom of the screen. You have to look closely you will see the contrast between the two bars fade and it will appear as a blank white area. I took my iMac back showed them this and they are replacing the panel. The guys at the store said they had seen one other defective iMac. Nice guys at the store, nice computer. It just seems like a luck of the draw as to what panel you will get in the 20" Please post your results and let me know.