Plug something other than Zone 2 into the splitter, say, any tape out on the Denon. Keep it simple. Play FM.
When and if THAT works go back to the manual and analyze why Zone 2 isn't working. Observe the Zone 2 Output indicator. (Page 5)
You must have a TV or other speaker-capable device that you can run Zone 2 OUT to. Try that to prove your setup works.
Register and download the manual for free at retrevo.com
http://www.retrevo.com/support/Denon-AVR-789-Receivers-manual/id/23110dj895/t/2/
Page 17, 30, 31, 57,65- 68 (you get the idea).
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