Hello, I've been plagued by the yellow tinge and some nasty flickering on my iMac 27", in an effort to make it obvious for the Apple staff during repair I created a desktop image that shows the problems fairly clearly. While my file is not very helpful in showing the yellow tinge problem, it revealed a weird pattern contamination problem that appears to affect all 27" iMacs. The staff at the local Apple store tested all their 27" and they all have the same problem. They assure me that the problem is software and will be addressed by a future firmware/software update. The problem doesn't seem to affect any 21" iMacs, we did not test the new cinema display. It's worth mentioning that this file did clearly demonstrate just how many iMac displays are faulty in one way or another, even in the Apple store itself, it looks like these displays are highly inconsistent. So I am sharing the file here to accomplish two things: - Verify that ALL 27" have the same problem - Motivate Apple to resolve this problem quickly screen_test.tiff It's an uncompressed 11meg TIFF image, set it as your desktop image to see it fullscreen. For the curious: my "repaired" iMac display still has some yellow tinge to it but less, it also has darker bands at the bottom but also mild...hey, it doesn't flicker anymore! I am sad to say that the general trend amongst iMac buyers is to try to find one "that you can live with" as opposed to finding one that lives up to Apple's marketing claims. Selling quality durable hardware is no longer profitable if you can "satisfy" your customers by being real nice about taking your computer away for 7 days only to replace the faulty part with another faulty part, over and over until they get tired of it and lower their standards to "what they can live with".