Ignition switch or starter or other?

2002 Grand Am GT 3.4L v6 52,000 mi
Every once in a while, when trying to start the car, it would turn over but not fire. Turn the ignition off and try again and it would usually fire right up. Yesterday, it started right up and drove fine, parked the car for about 40 minutes, came back and it won't even try to start. The battery is less than a year old, but I tried to jump it anyway, still nothing. When you turn the key on, all the power accesories work fine. When you try to start it, there is nothing, not even a click. Left the key in the ON position, and shorted the starter solenoid. The car turned over easily, but would not fire. Also tried all of this in Neutral with the same results. Any help would be much appreciated! Thanks!