With my Sony DVD player I also had to go into the menus and enable the digital output from the DVD player -- it was turned off by default so there was only a signal on the stereo analog outputs. Your Denon probably won't need this, I mention it just in case you hook up with a digital connection and it *still* doesn't work.

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8