Engine cranks but no start up?

I went to a Murphy's at my local Walmart. Got gas. Literally moved about 20ft into the parking lot and shut off engine. Played on my phone for a bit (checking bank statement, etc, ) tried to crank up and nothing happened. Over a course of 3 days I replaced battery, alternator, and starter still no start. Attempted to jump start it and still no start. All it does is crank crank crank when I turn key but will not start.

A little back story on it, the serpentine belt did snap on it few days before the no start incident began due to loose compressor. Tightened down the compressor and replaced the belt the following day. Before I could replace belt I was stuck in the middle of town with my wife, 5 year old and 7month old in 40 degree weather at about 10:00pm so no store near me was open, so I had to drive home with no belt. What can be causing my crank, no start problem?

My vehicle listed above is having problems with the throttle. I have change the throttle positioning sensor, the actuator motor that's on the throttle body, oil change. The pedal positioning sensor all it does when you turn the key to the on position is that actuator motor clicks three times and then no accelerator pedal what so ever. It has happened three times now; first time is left me stranded for three days the other time just two hours and now two weeks. I've checked all fuses relays and wiring that I can get to and I put a different computer in it which I knew would not start it. It did the same exact thing the three clicks when you turn the key on and then nothing. The actuator motor makes a bunch of clicking noises when you start it and then continues to making those noises. I don't know what's going on, but I need my car back.

I changed harmonic balances on sohc 4.0. The wood-ruff key did not go in right so when I tried to start it after I put it back together the key was not holding the timing gear, so the crank turned but not timing gears. I took it back apart get the key grooves lined up again and put new key in and got it back together correctly. But now it will not start. I tried taking it back apart and turning the crank 180 degrees on the timing gear and put the key back in, but it still will not start. Someone please help!