I've noticed a small line developing at the top edge of my MacBook Pro's screen, barely longer than an inch from the top. Now, is this a crack? I'm only asking because as I pick up my MBP and turn it side to side, the object seems to move with the behavior that it's behind the screen. For instance, when I turn it, I see it moving relative to the letters on the screen to my viewing angle. Also, looking at it from the side (about a 70º angle) it's invisible. I've read that some people have had hair caught in between their screen and backlight. If this is my case, how on earth do I go about removing this annoying thing? If it's a crack, guess I'm SOL. 2007 MBP with no warranty.