Went to the Apple store yesterday and picked up a 15.4'' 2.2 Matte MBP. After reading through this forum for the past few weeks, I was really hesitant on pulling the trigger. 1. It appears my screen is the 9C68 (Samsung), which was a little disappointing since I've gathered that the LG screens have had less of the yellowing issues. And also that Samsung seems to be more prevalent in the glossy screens and not as much in the mattes. My build week was 23. 2. Looking at the screen dead on, it appears to be perfect. However, any angle to the left or right turns all the colors to a yellow tint. Looking at it from the top, the colors turn blue. And looking at it from the bottom, it is sort of greenish. Is this case with all the LED screens or just the Samsungs? Or is my Mac defective? In the few hours I played with it, I didn't notice any yellowing in the bottom 1/3, but the yellow while viewing at even a slight angle concerns me. 3. What is the 2nd 3 prong power cord used for?