Speakers won't work after new HU install

[Osgood]

Good morning all..
Quick question....is there a seperate fuse for the speakers and radio or is the only one for the audio system located at the back of the factory radio?
I recently replaced the factory HU and when I first intalled it/hooked up everything it worked fine. When pushing everything back into the small cavity for the radio, I think something grounded out, as I now have no sound. I've checked all connections, and the head unit still has power to it. Just no sound whatsoever. Odd.
If I smoked the head unit, oh well....the fuse for IT (located on the backside of the unit) is fine. Just the speakers have nothing coming out at all. Odd.
I'm just about ready to buy a factory unit and toss back in there. Jeesh. My factory cassette deck was messed up, or I'd have left well enough alone.
Thanks in advance!
Ben