1989 chevrolet caprice electric issue!?

i had boughten a new stereo for my chevrolet caprice 1989 and was connecting the color wires but someone happend to grab a cable while i was wiring the power cables and stick it idk where but caused a spark and the interior lights went completely off and the lock switch wont work and neither will the interior lights wont turn on please help what is wrong 10 points to who can answer my problem please