Hey all. I got my 17" iMac today and the thing is beautiful! However, I am a little concerned about my screen. I have some backlight bleeding at the top and bottom of the screen in the middle. It is very noticeable in frontrow or when playing a widescreen movie. Also, the upper left corner is slightly darker than the rest of the bar at the top. This may be from the extra lighting in the middle... should I be concerned about this or is it common? Should I try to get an exchange?? The middle area of the top of the screen is rather bright...