I am new at asking for help so tell me if I am doing this wrong. My Phantom 3 Standard has always flown and responded to all commands flawlessly until this minor crash. The camera will not move when powering drone but shows what it is looking at and takes pictures of same. Yard arm is not broken. Drone lights blink yellow when power on but motors not running; flash green when engines running, shows8 to 10 sattilites, GPS; ready for Takeoff. Flies fine; all controls work; no response to gimble calibration. Set screw between motor and camera tight against flat side of shaft; can gimbal manually by turning gimbal motor with finger. Two ant wires conected and look good and as is the large grey ribbon wre. Any help anyone can give me of where to start trouble shooting and parts likely to need replacing to make gimbal operate as it normally has in the past will be greatly aPPRECIATED. DON. (94 yrs old but still have a little sense!).