I've had this tv for roughly 2 weeks now. I just noticed about a day ago, at the top of the screen,there is a dark bar (this is all the way across, and not quite as thick as the black bars from an animorphic movie in 2:35 to 1.) It is noticably darker than the rest of the screen and i KNOW its not burn in since i am very careful with my contrast settings (i have it at 25 and the brightness at about 55 sometimes 60 depending on the movie. Not to mention most of the movies ive watched so far have been the 1:85 to 1 aspect ratio. even with that i havent had oodles of time to have it on for more than around 3 hours a day. I really dont know if this can be corrected with calibration, or if i should just try exchanging it while i have time. Need advice a.s.a.p ....... thanks.