JVC KD-AVX44 CD/DVD/USB No Sound

Hi. I had my JVC KD-AVX44 installed in my 96 Jeep Grand Cherokee, powering my 2 12" Kickers. I ended up totaling it about 2 weeks ago. Now I have a 97 Grand Cherokee Limited. It has the premium sound with an Infinity factory amp. I installed my head unit and only the radio will work. It will read a CD, DVD, Ipod, and flash drive just fine. I am able to skip tracks and all, but no there is no sound. The radio works fine though. I don't know if it has anything to do with the factory amp (I hear they are a nightmare). The head unit worked in the other Jeep (without premium sound) just fine the day it was removed. Any help is greatly appreciated. Thank you.