Don't worry about it!
Obviously, bearing in mind how many iMacs that are sold worldwide, there are sure to be a few "rogue" machines. However, Fora such as this one are a magnet for people with horror stories - some of which I personally find hard to believe. As far as the so-called "yellowing" problem is concerned, judging from some of the screen shots used as illustrations, I wonder if the complainers eyesight is mainly at fault!! Don't forget you can always adjust the colour temperature of your screen.
I use my iMac for photo editing too and I'm sure you'll find the screen on the latest iMacs truly amazing for this purpose.
Just enjoy your new machine and don't believe everything you read!!![]()
My issues are minor and as you can see most people here have a perfect iMac! Just want to reiterate I did not start this thread to say how bad the iMacs are, just to see how unlucky some people are like myself to have gone through so many... Also apple's customer service is amazing, i bet many other companies would tell me its my fault i have had 6 bad machines... apple just says sorry for your luck and we will fix it no charge!