Hi all, I bought a samsung monitor in feb, and recently, I've noticed white at the top of the screen. What I mean is, when the screen at the top is black or dark, I notice a white gradience going up from about 1 inch down the screen to the top. Its in a parabola like shape. (This is a 19 inch monitor fyi) Is this bad? Its still under warranty, should I see if I can return it? Thanks!