I would check the outputs of the dvd player. Analog, digital, optical out or digital coax. I have a Yamaha dvd player and it can get real anal on me sometimes when changing from dvd audio and 2 channel audio. In some cases I have to put a dvd disc in the player to change from dvd audio to analog audio. Also in my case I must have the TV on and the OSD on to see what I'm doing. I don't know what type of player you have so this may or may not help good luck
Coman61
Coman61