Buick Rendezvous Security Light

Had A New Starter Cylinder Installed But The Anti-theft System Won't Recognize The Part And Thus The Vehicle Will Not Start.

Okay, See If Someone Can Help Me Out. I See Myself As A Pretty Good Mechanic But I'm At My Wits End. So Let Me Tell The Whole Story...

The Security Light And The Word Lock Appeared On The Dashboard. I Also Hear A Beeping Noise Under The Steering Wheel. The Power...