could you be a bit more descriptive? Did you look inside the gearbox, did you test to see if the motor ran outside of the gun? Were the batteries fully charged? Answer these and go from there. As for the motor clips, they come loose if you screw with them to much or they ar repeatadly taken on and off the motor. It could just be the clip, its eisily replaced. Or it could be somthing else. Like I said, answer those Q's and go from there.