please help i just bought a Yamaha RX-V477 (great reviews for its price [5 stars]). ive connected a output to a plasma tv without a inbuilt tuner via HDMI a settopbox via composit cables and a dvd player via componet and optical cable but when i turn it on (TV then Receiver then the settopbox) i only get sound (lets say from the settop) and when i press menu get a menu on the tv(receiver menu) and no other video. The dvd player doesnt work at all. Any ideas that might help?