Here's mine. Purchased a 21.5 radeon model. It had a piercing LOUD high pitch squeal coming from the monitor. Returned it, got marked DOA. Came home with second 21.5. Horrible yellow bottom half of the screen. Returned it, marked DOA. Decided to upgrade to 27" since, at the time, it appeared the high pitch noise and yellowing were a little less apparent with these. Came home, yellow tint, returned it, marked DOA. Upgraded to Core i5 by request of my gf. Has a slight yellowing at the bottom (like all new iMacs) but its tolerable for the type of editing i do. Called Apple - Customer Relations guy was a total dick (Michael Aloo, beware if you ever get this prick). Got transfered to someone else who was AWESOME, very nice, sending me a free 8gb RAM upgrade for my trouble. I pretty much earned the RAM with all the manual labor of unpacking/repacking/walking around malls.