Hi,
Just to verify...
When you take the HDMI cable from the Blu-ray player output which is in turn connected to the Denon 2311 AVR [Audio/Video Receiver] BD HDMI input (which works and does both audio/video)...
...and then you plug that HDMI cable into the Zotac N230 HDMI output...
...you only get video and no audio?
What is the Brand and model of your Blu-ray player (ie. Sony BDP-S370, LG 2000, etc.)?