Starts will not run

I did not realize this happened so much! I am guessing there is the little amber "Security" light flashing, on the dash? Even if it is not, this is worth a try, it is free! My jeep did this, when the battery got really low, and I jumped it, and one time it did it when I opened the wrong front door first. Put the key in the driver side door and lock and unlock it at least 5 times, and try to start it. My wife left the park lights on in her jeep and it stayed at work for a week before a friend who worked at a dealership told me to try this. They do not often give this info out.