I know there have been hundreds of posts on the yellow tinge thing and other screen issues with the new iMac line, but I have a different problem that I haven't found anywhere else. Randomly, I get a thick yellow bar down the middle of my screen. About 3 inches wide. It might last a couple minutes, or 30 minutes. Not usually for very long, but shows up every now and then. The weird thing is that the yellow only shows on white. So if I had a black desktop background, it doesn't show. Actually - I did some tests in Photoshop and found out the yellow shows on any color with 255 as its blue RGB value. I find that very weird. Has anyone had or heard of anyone having this same problem? I've searched and searched and haven't found it. Of course, I'm going to call Apple, but I wanted if it is widespread or not.