1997 Hyundai Elantra No start

My 97 elantra stalled with no noise, shake, or anything. I didn't even know for sure the engine had shut off. It will not start again, I have checked the starter and battery at first and they were ok. I then checked the fuel pressure, replaced the fuel filter (It needed it anyway), checked the pump, and fuel was getting to the cylinders.

Then I checked out the ignition system. I started at the plugs to check for any damage or overheating concerns, but to no avail. I went ahead and changed the plugs and wires anyway, and confirmed they do spark, but the engine still does not crank.

The Idle Air control Actuator hums when the key is in the 'run' position, but the rotary gate in it does not open until in the 'start' position. This seems normal except the door only opens about 1/8 inch. Not nearl all the way it seems it should go.

While I was frantically removing and checking components, I checked the timing belt and valvetrain system (The entire Head basically) and they seem just fine. Almost perfect surprisingly. I want to know if I would be getting any spark if the crank position sensor was bad, and if the idle air acuator is only supposed to open that little bit.

Also, when we've tried starting it recently, the actuator would hum and occaisionally emit a loud grinding noise.

Any help on anything else I can check please?

The actuator costs 270 bucks and I'm making absolute sure it can't be anything else.