:welcome: to the forum.
Trying to sort out what is happening.
Any chance you can take a pic of what is spinning, and post it? Go Advance button under the post window and browse for that pic once it is on your computer filed somewhere.
"seems like" doesn't help much. Of the engine is turning over with the starter, then you should here it exhausting air.
Might try taking a plug out, and letting it rest on the motor such that you can crank the engine and look for a spark at the tip. A good spark will lead us to the next challenge and that is to get fuel into the cylinder.
Let us know how the spark test goes (and keep in mind, the spark plug needs to rest on something that is grounded).
Also, cranking doesn't mean the engine is running. It just means the starter is turning the engine over (and that may be happening if the screen thing spins).
Feed back some more info, so we can attempt to get you going again.