I have a question about the main screen on the Xbox. When I first turn it on, there are some-what faint green lines across the Xbox title screen. Is this normal or do I have a defective console? I don't notice any lines when I am playing games or watching movies. By the way, I am only using the composite video cable that came with it, since I haven't had a chance to get one of the other cables. Thanks for any help on the situation.