I just bought a 12" PB 1.5ghz superdrive like less than a week ago, and I noticed that whenever I go to fullscreen mode (like in a slideshow or when I load up Warcraft III or something) the top line of pixels starting from the center to the right side of the screen flickers... so it looks like this flickering bar at the top right hand side of the screen... Should I take it back or what?