Replaced Z34's battery = no start now

Greetings all...I just inherited my brother's 1994 Lumina Z34. She stopped cranking in this cold weather, and since the battery was over 3 years old, I changed it. Mind you, there was juice coming from the battery, just not enough to crank it over. The starter was fine. I just put in a Sears Diehard Gold today and all lights, radio, etc. are functioning except now the car is TOTALLY dead. When I turn the key, nothing. The security light looks like it's going balistic now too.

Is there a security issue at hand that has to be reset in some manner since I disconnected the battery?

Any insight would be greatly appreciated save me from going to the mechanic.

Regards,
Drew

Nevermind...I got it. Just had to use the remote lock, unlock for it to let me start it...

Regards