I have a HHR SS '08 Premium Sound system with it.

What I have that I am installing is :

- jvc kw-av50 double din

- LC-GMRC-LAN-03

- 2 12' kickers

- 1100w (150 rms) crunch amp

the sub and amp are not even plugged in when this happens. Just thought I might include it :)

Well we have everything wired correctly with the harness we have. Now we plug everything in, Screen comes on. but no sound is being outputted. We plugged the stock unit back in, and sound is still coming through. Next we thought that the headunit might be bad. We found a tiny speaker, and hardwired straight to the back of the aftermarket headunit, and sound comes out, so that rules out a bad headunit. We are stuck with this, and do not know what to do. Is there something else I need because of the "premium" sound i have?
Please help! My baby girl is in pieces right now, and do not want to put her back together! :/