For anyone still reading, I am now on my fourth iMac. YES, fourth for 2011. No excitement even left in opening the box any more.
Screens/iMacs 1 and 2 both had Western Digital noisy drives and screens with yellow tint. Screens/iMacs 3/4 have the much quieter Seagate drive, but the screen issues are a bit different. In the slightly newer ones, there is a dark bar that runs just above the doc, from left to right. There's STILL uneven brightness in all of the monitors though, with bottoms betting too hot compared to tops. iMac 3 had bad light bleed in bottom left and right when watching movies, while iMac 4 has less light bleed at bottom corners, but now introduces some in the top left and right. iMac 3 was the only one without yellowing. Had its backlight been just a touch more accurate, I'd have kept it. Now, I don't know what to do, and this whole debackle is costing me time and money.
Anyone considering this iMac and screen combo should read what Apple states -
"...LED-backlit display is... uniformly bright..."
"The iMac display looks great from any seat in the house (178 degree viewable angle)"
http://www.apple.com/imac/features.html#displays\
Apple "Geniuses" were biting their tongues on those quotes by the 4th exchange. First exchange? "You're the first person to have had that problem". Funny, I hear that kind of bs line parroted around a lot online for customers with similar problems.
I think Apple better change its advertising statements before someone considers a lawsuit. As it stands, I should be billing them several hundred for all the hours of down time.