I recently bought this racing Quadcopter that was called the Walkera Runner 250. It flew well until I crashed it. It was about 35 feet up and then I dropped all throttle and could not correct it after adding more. It crashed on one side but nothing was apparently broken. Then when I tried to fly again one motor was not turning. There was no noise or anything coming from the motor to signal if it was trying to turn. When I plug in the battery to the quad then all the motors spin in one revolution (this is normal startup). I took the quad to my local hobby shop and they said they could replace all the motors and esc for $500. I got the quad for $300 so it would be worth it to get a new quad instead of paying all that to fix it. Does anyone out there know something that I could do to fix this problem. I would like to fly soon again. My location is Sacramento area in California. If anyone knows of any hobby shops in the area that would be helpful to me please let me know.