My problem started when I tried using the fob to unlock the car with the fob. Nothing. I used the key to unlock the car, then opened the door followed by the car's alarm system going off (midnight in a condo parking lot). I put the key in the ignition and started the car, the alarm stopped and the engine quit right away. Started the engine again, and it shut off immediately again. Then, nothing. No starter turn at all.

After replacing the batteries in the fob, still nothing. Tried reprogramming the fob. Nothing.

Fortunately, someone in my group had a smart phone (along with a dead battery in the fob, my phone battery was dead too). We used it to connect to CrossfireForum.org, where we discovered that disconnecting the car's battery might be a good thing to try, followed by reprogramming the key fob. That worked.