Stopped and shut off car. I went to start and there was no sound?

Do the headlights/dome lights come on? If not, it sounds like the battery has shorted out which happens, or you have a bad connection at the battery. To be sure let's use these guides to help us test the battery, you don't need equipment to do this test:

https://www.2carpros.com/articles/car-battery-load-test

and

https://www.2carpros.com/articles/everything-goes-dead-when-engine-is-cranked

Please run down these guides and report back

So, I am assuming the security light keeps flashing when you try to crank it over? This is how to reset the security system and this guide can help as well. Also, you can try to reboot the car by holding the negative cable (battery end) to the positive battery terminal for 1 minute.

This guide can help as well:

https://www.2carpros.com/articles/how-to-reset-a-security-system

Immobilizer System Component Programming

10-Minute Immobilizer Relearn

This 10-minute relearn procedure will relearn the fuel continue password between the theft deterrent module (TDM) and the engine control module (ECM).

1. Connect a scan tool to the vehicle in the pass-thru arrangement.
2. Turn ON the ignition, with the engine OFF.
3. Ensure that all power consuming devices are turned OFF on the vehicle.
4. On the Techline Terminal, select Service Programming System and follow the Techline Terminal on-screen instructions, using the Legacy Pass-Thru method. Ensure the correct programming selection is chosen based on component being replaced or programmed. For this procedure, go to the V.T.D. Vehicle Theft Deterrent Learn menu and choose the Vehicle Theft Deterrent Learn for Powertrain System selection. Ensure the correct Vehicle Theft Deterrent Learn for Powertrain System selection is chosen based on the engine RPO of the vehicle being programmed.
5. At this point the scan tool must remain connected for the duration of the 10-minute relearn procedure.

Important:
* The scan tool will initially display 12 Minutes. The first 2 minutes allow the scan tool to initialize the appropriate control module. The remaining 10 minutes is the relearn timer.

* On some vehicles the security indicator may be illuminated for the duration of the 10-minute relearn procedure.

6. Observe the scan tool, after approximately 10 minutes the scan tool will display "Programming Successful, Turn OFF Ignition". The vehicle is now ready to relearn the key information and/or the passwords on the next ignition switch transition from OFF to CRANK.
7. Turn OFF the ignition and wait 2 minutes.
8. With a master vehicle key, turn the ignition to the RUN position for 15 seconds, then start the vehicle. The TDM and ECM have now relearned the fuel continue password.
9. With a scan tool, clear any DTCs.

Please let us know what happens.