Replaced fuel injector - now engine will not turn over
 

I replaced the #2 fuel injector on my 2002 Protege LX. Now when I try to start the engine, the starter will not engage and nothing happens. Note - I had taken the negative battery cable off before I replaced the injector, and when I reconnected the first time, the alarm system went off. I put the key in the ignition and reconnected - everything seemed fine. But the starter will not come one, - is there some security thing I need to reset?
Rydjor