This happened yesterday. I've never had problems with this truck. It is towing a horse trailer. I was making some tight turns in tall grass. I thought because I had left the keys in the ignition that perhaps it affected the security system somehow and shut down the truck or that the steering column had locked up. (Steering wheel is not locked up-it turns fine. I checked the connections to the horse trailer, thinking maybe something had come loose and caused a problem. Everything looks fine. The power windows & radio work. When I turn on the key, the dash says check gages, they all look fine. Engine won't start, and I can't get the key out of the ignition. The truck was running fine before, battery is fine, it has 1/3 tank of gas. There is probably some simple solution, but I don't know what it is.