So, my heli took a bit of a hard crash. It got caught in some wind and landed on a rock. I don't see any visible damage but the blades don't engage. You can spin them fine with your hand but they don't seem to be getting power. The other functions work. All functions on the right hand knob work and functions other than throttle work on the left hand knob.

I don't want to just replace parts but I'm not sure how to narrow down the problem.<br type="_moz" />