I have a Motorola Dual Tuner DVR Cable Box, (Comcast)a new HDTV and a RCA DRC8300n DVD Recorder/VCR Combo. I cannot get the RCA to work. It says no video input. I have used the S-Video connection, composite and component hook ups and nothing works. The cable company is no help. I know that there must be a way to do this, hope someone out there can help.