2003 Pontiac Grand Am won't start

I bought a 2003 Pontiac Grand Am a month ago, I have already replaced the power steering pump, the water pump, plugs and wires, new battery. It was running fine I drove it last night, but the radio has said loc since I bought it. Then today I got in it and tried to start it and it won't start. It turns over like it is going to start but doesn't. I tried the 10 minute reset thing. That didn't work. Please help, I don't have the money to keep throwing into this car, but I need a car that run's.

Three main things an engine needs to start, spark, fuel, and air.

To test for fuel-or fuel delivery- most likely-- spray some carb cleaner in air intake, does it make some shots or run till it runs out of carb cleaner?

Spark-next likely- needs a spark checker. would only apply if no shots fired in above test.

Air- least likely -does throttle open- air cleaner plugged.