jump started with another battery, went to connect orig battery back up, car dies, when we try to reconnect it the hornstarted blairing. now it wont start at all.

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car was having problems starting. one day it wouldnt start at all. had lights, power to everything, just a clicking noise/no engine noise. jumping it would take care of it. one day out on a job, car wouldnt start. no one had cables, so we grabbed someone elses battery to start it. fired right up, as we were disconnecting the good battery, the terminal came lose an hit the battery and shut it off. we went to reconnect the terminals to the original battery, horn starts blairing 3Xs. Ever since then, we cant jump it with a battery, jumper cablea, nothing. we got a new starter, nothing but clicking still. took old & new started to az, old one was bad, and the new one works. what else can it be? did we short something out? maybe some kind of security system? please help!!