Arod3025

Okay so I have a 2000 Mustang with stock speakers. (I put in the dashboard trim from an '04 so that I could use a 2 DIN stereo instead of a flip screen) Anyway, I just finished installing the stereo and everything works great except for the fact that I have zero sound. Can somebody please tell me what I should do? I've only installed a couple stereos before and all the wiring was fairly simple. I don't know where to go from here.