I just got a brand new 24inch 2.4ghz yesterday and noticed right away a brightness gradient from left to right as well as a color cast going from blue to yellow from left to right. I did some searching and found this forum: http://discussions.apple.com/thread.jspa?threadID=1093045&tstart=0 which really disturbs me if all the new 24 inch imacs have this problem, people have said that they have replaced 3 or 4 imacs and that they are still having the problem, and apparently you can go into a apple store and see this very problem on the display 24 inch imacs. I got the 24 inch because the monitor has better viewing angles than the 20 inch as well as other better qualities, but that doesn't matter at all now because of this problem, I need this computer to do color sensitive work but cannot afford the mac pro with cinema display. I know no lcd is perfect but this is ridiculous!!!! I plan on sending it back and getting a replacement but from what I heard they all have this problem, and replacement wont help. But yet I can't find anything from apple addressing this problem. Anyone else with a 24 inch iMac that can confirm this problem? If you want to test it go here: http://www.lagom.nl/lcd-test/#angleGrey and make your browser smaller so you can move it around the screen and see if the background behind the lagom changes when it's on the left side of the monitor or the right side, mine shows a significant increase in brightness on the left side of the screen.