Aftermarket deck w/ factor amp... no sound?

I can't figure out why my new head unit won't work and I need some help.

I've tried two different head units... both had power, the CD played, but I couldn't get sound out of any speaker. I've checked volume, balnace, faders, etc... but still nothing is working at all for sound.

I'm wondering how the factory amp turns on... I read that it turns on via the Class II wiring, which to me would still then be turning on the amp when the radio is on... but who knows.

Do you think I need to run a remote lead from the new aftermarket deck to the factory amp to get it to turn on? Does anyone know if that factory amp (I've got the Sun & Sound package) run's all 6 speakers, or just the dual voice coil 6x9's in the rear deck?

Any help is greatly appreciated... I've been without tunes for so long now it's really driving me nuts!