Is there a problem with some thing?

A few months ago I bought a new Stellar Gain Cell Dac/pre, its been a good investment up to now. I decided to play a friends recent (organ) SACD with my Sony BP PX800, which is connected to an Anthem MRX520 ( HDMI). I never had a problem getting it to play when I just had it connected to my new PSS300 power amp. All I get now is a white noise playing. My question would be is the addition of adding a SGC Dac/Pre cause something to happen. It is connected to the A/V amp via the pre outs