I recently updated to comcast HD cable service. Everything on my system goes through a Yamaha HTR 6090 AV receiver. I haven't used my Sony DVD recorder in a while and attempted to make a recording. When I record from the cable box (TV), I get audio, but no video even if the broadcast is not HD. When I try to record from a VHS tape, I get a perfect recording. Anybody have a similar issue, ideas?