I knew I would have problems with my new iMac... And yes, I'm disappointed! with the last 4 items I bought from Apple I had problems. I bought an iPad2 in 2011 with severe light bleeding. I bought an iPad3 in 2012 which does not charge properly. +16 hours for a single charge. I bought an Apple TV which was flashing black and white screens all the time. So when I bought my iMac, Apple Care was a no brainer... I have yellow tinting (not severe) but got used to it and wanted to live with this issue. But now when I use my iMac for a couple of hours the screen warms up and the image retention appears. A lot of people suggest this is normal for this type of screen and the problem only appears after stress testing the machine. The image retention on the login screen was there after I had shut down the machine for more than 15 minutes... I'm going to call Apple this week for a replacement. How will they handle this? Will they send me a replacement first or do I have to send in the machine for repair? I did not alter these pictures in any way. This is how I see the image retention.