Just bought the Denon AVR-3803 receiver. I am getting two faint interference lines that scroll up the screen (green and violet) when I plug an s-video into the receiver and switch to component out. If I do component in signal (DVD) and then component out, I do not get the lines. I've unplugged the cable line and the lines are still there. The receiver has up-convert capability. Any ideas what is going on?