As many of you are, I am frustrated. I am currently on my 4th new iMac for REAL yellow screen problems and one that emitted a brain piercing squeal at certain brightnesses. I finally got an i5 that had baaaaarely any yellow at the bottom, so I kept it. Now, after a little over a month, we are seeing what looks like black streaks behind the top left and top right of screen. It's almost like someone poured liquid back there and its dried. My GF does photo editing and initially noticed this, and yesterday I myself noticed upon boot. It's clearly visible on any white screen and shows up on certain other colors as well. Has anyone had this problem? What is it? What was your course of action and how did apple handle it? Any info is greatly appreciated. If you need me to post pictures, just let me know and I'll get them up asap. Thanks for your time.