I just purchased a Yamaha RX V481 receiver. I have it connected to my Samsung HDTV with one HDMI cable from the output source. I have my dish receiver, Samsung blue ray player and Wii all connected via HDMI source inputs. The only source that produces a picture on my TV is the dish. I cannot get the blue ray or Wii to output video to the TV but can hear the audio thru the surround sound. I have tried disconnecting the dish and the blue ray still does not output video. I have alao tried changing around the outputs.  Not sure what else to try.