Make sure you didn't wire the amp backwards. If you blew a fuse before you een started it up, that could be why. Check and be sure that the ground is going to the GRD terminal on the amp, and the power supply from the battery is connected to the Batt terminal.
Not giving you a hard time, I know a few people that, not wantinf to wait another minute to hear thier stuff, instaled it as fast as they could and poof... bye bye fuse