I have a 1993 RCA F27700mg and I'm trying to connect my DVD player and Xbox. In the setup menu I've selected two "VCR" channels, but I when i switch to them i get nothing but static. I've tried various wiring combinations using the Red White & Yellow, or the S-Video, even the coax in from my VCR. It seems like the TV doesn't know where to pick up the signal. I've flicked through all the channels. Can anyone help?