Background: I have an NEC VT45 LCD Projector to which is connected directly to a Sony DVP-CX850D 200 DVD Changer utilising an S-Video connection (3 metres long). An LG LV800 VCR and a Cyberhome AD-L 528 single DVD player share a composite video connection to the projector. The projector is mounted on a back wall adjacent to a double power point socket; the power chord of the projector has been reduced to about 18" in length. Sound is provided by a Panasonic AV Control Receiver SA-HE9. Problem: When playing back DVDs, TV or Videos I get picture interference - slow moving lines that move up or down the screen. Question: a) Does anyone know what creates these lines and why. b) What is the cure as watching DVDs is marred by this problem. Other than that the complete system works well. Many thanks to anyone who can provide the answer and put me out of my misery.