I sent an email to Steve Jobs about my yellow tint 21.5 iMac issues (three exchanges, all affected, resulting in a refund). I got a call from Dena at Executive Care within 24 hours. She said they are aware of the problem and do not know how widespread it is. According to Dena, the issue is not resolved and that ordering a new iMac will not result in a fixed display. She said the engineers are working on it now and they are not sure if it's hardware (most likely) or software related. Further Apple stores cannot do repairs because they haven't determined what the issue is. Her advice: "Wait to buy one until the issue is resolved."