Turns over but won't start.

I would recommend replacing the battery. Try jump starting it. If it starts, it's likely a battery or alternator.

What if its not battery or alternator replaced BOTH

Make sure your shift sensor is working. It could be called (neutral safety switch, transmission range sensor, or something along those lines.) It's tough to test these sensors without a decent mechanical computer. If it doesn't cost to much, I would buy a new one and return it if it doesn't fix the issue. You could have other issues but its hard to diagnosis without more information about the crank/start attempt (the way it sounds) and if any lights on the dash are on.

Did you find out the problem