Hello Everyone, I'm a new iMac owner as of today. I just got the 27" i5 3.1 GHz. Upped the video card and the hard drive. That aside, I've been reading about the yellowing issue. I got home and fired up my iMac and at first, it seemed to me like the screen was "dirty". After looking at it more, I opened up a screen with a full white display and took some pictures. It appears where it was "dirty", is a dark band across the bottom 1/3rd of the screen. If I can post a picture, should I return this computer for a different one?