Your key could be dead...If the key isn't being used for a prolonged period of time the car will not start. All the lights will come on but no engine start...Put the key in and turn it to the on position (position with all the electrical on) leave it in there like that for about 30 minutes. It might charge the key up.. Then try to start the engine. If it does start, drive the car around for awhile to try to get that key charged up longer.