Amp power but no sound threw any speakers, please help.

Ok so I'm running a ken wood kdc 252 u head unit, 2 twelve inch duals and a Sony xplod 1000 watt amp. I've run the same set up in a previous car. Now I am trying to put them in a new car. I get power to the amp but no sound comes out. I thought the speaker were blown from an accident in the old car but I've tried 3 subs and 2 different kinds of door speakers. Still no sound. I tried two different head units thinking the outputs were shot but still nothing. I tried two different amps and neither one gave sound. I tried 3 different ground spots and still nothing. I know I get power to the amp because I hear the fan kick on in the secondary amp (no idea what the brand is or the wattage) I've tried two sets of RCAs as well. I have NO idea what I can do differently. Please someone come up with something. I have no idea how to test anything with multimeter. I know it's not the best setup but it did the job for me. I'm getting completely frustrated.