New Marantz 1506 AVR and 5 year old Panasonic TV and DVD BluRay, both Viera's, can't connect. Cable is coax from wall to the TV, HDMI from DVD to AVR, HDMI from AVR to TV. Marantz auto-set up (very slick) can't see either - no pic, no sound. I've tried two new HDMI cables - suggestions please!