Just bought a Yamaha Home Theater in a Box - YHT 360 for my neice. Hooked up coaxial cable for PCM sound from DVD player to INput 3 (where coaxial cable goes to on receiver). Went into menu and assigned INput 3 coaxial to DVD player. When I tried the DVD player, there's no sound. Looking at receiver it shows PCM is lit but no sound. What could be wrong here?