Well, the fist thing to connect to the monster cable running from the battery to the amplifiers is the fuse, and if you have multiple amps, then a good power distribution block has a few fuses in it as well. (Especially if installed by professionals)

As Tony stated, check the fuses, they are likey what is shot. And while you are at it, better check ALL your fuses, you never know what fuse 18a does till you need your airbag!

Cheers, let us know what the total fuse-body-count is.

Smoker_Man
#080000449 MkII - 36Gb Blue