G20 car won't start not batt.

Drove car 227 miles about 3 and half hours. When turned car off to go inside convinent store, came back to turn car back on, it decided not to start. I put the key in and started the ignition. I can turn my key all the way to the start position and, although all the diagnostic lights turn and radio turned on as usual, there are no noises or clicks. The car it self wouldn't start. Had to try at least 5 times before car turned back on so I can hit the road again. Battery is fine. Car has 154943 miles on it.