http://www.amazon.com/Kicker-Digital-Stereo-System-iPhone/dp/B002I529AY and many other things Apple no longer output such signals. The topic is pretty well done but here's the deal.

https://discussions.apple.com/message/13210604#13210604 -> Is dated but notice the troubles folk have. And you are not using the Apple cable so you are in a place I fear will be without cellular coverage (code for the abandoned feeling you get.)

So like we read at https://discussions.apple.com/message/13210604#13210604 try the reset as noted and the real Apple HDMI cable.
Bob