Hi. I have send back the replacement yesterday. Both have the same problems : yellow tint, dust under the glass, some dead pixels... Now, I don't know what to do. I noticed that the Macbook Pro doesn't suffer this ******* problems, so I have stated to think about change the iMac for a Macbook Pro. Well, I will loose the big 21,5" screen, but I can get a good Dell screen. On the other hand, I don't need portability, I just like it. I will use for photography, iWork, and games.