Try going into the menus on the Sony player and make sure the digital output is setup properly. It's usually turned on and you have to go into the menus to turn it off, but in your case maybe somebody already did this.
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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