interference??

[tgm4883]

Im not sure where exactly to post this, so if there is a better forum, please point me in the right direction. This is my current setup.

1. Comcast HD Receiver (Connects with Component Out and Optical in 1080i)
2. Toshiba SD-K700 DVD Player (Connects with Component Out and Coaxial) I can only get this to output in 480i
3. Gamecube (Standard yellow video cable, red/white audio)

All of these connect to a Denon AVR-1603 AV Surround Receiver

The denon receiver connects to the wall with component, and through the wall goes up to my Sharp DT-200 Projector which projects on my 92inch widescreen

These are my problems, I have diagonal lines running across my screen. In both DVD and HDTV. Is this caused by interference??? I will try to take a picture of it, but I don't think it will show up. Am I making any sense, or just rambling on?

[edDV]

A picture would help.

Try connecting each device to the projector bypassing the amp and see if interference is still there. Or try disconnecting all but one device to the receiver. Note when interference appears and disappears.