Search, search, SEARCH! But really, check all your connections. Make sure that everything is plugged in securely, and get a voltmeter, and check that power is being delivered to the wires. If not, trace the wires to the source, or locate them with a wiring diagram under the dash, and once you find out where your power goes from live---> dead, you'll be able to go from there. Chances are something came loose, or you blew a relay/fuse you don't know about.
