Ford F-150

If you turn the key and you have electrical power to the accessories (like the lights, radio, etc.) then the fault is either a damaged ignition relay, starter relay or faulty starter. If you turn the key and nothing happens - meaning no power to anything; then the likely source is the battery, battery cables or the main relay. It’s also possible that this could simply be a stuck security code that has disabled the ignition system. The Starting System Fault message is hard to diagnose, so you might need a professional mechanic with a digital scanner to help isolate the root issue.

If the battery is 4 years old or older,it's time for a replacement.

Jorge knows!! Good lesson to learn tonight)