Sounds like you know how the anti-theft works.
I would remove and re-seat the electrical connectors. Check them for any pins that are bent, pushed deeper into the connectors, etc.
It's probably a connector/pin issue but worst case it's possible that you cracked a solder connection on the circuit board... inspect where the connectors on the board are soldered to it, look for cracks which will usually appear as a thin, dark ring in the solder around the wire. If you suspect cracked solder, I'd probably take it to an electronic repair place to get re-soldered... soldering small electronics isn't easy, I've been soldering stuff my whole life and I wouldn't try it on something with a lot of small connections close together.
