P3A crashed, separated gimbal yaw motor, and tore ribbon cable. I replaced the motor and arm as well as the ribbon. I turned it on and the gimbal just randomly cycles and gives the gimbal motor overload error. Tried to calibrate gimbal w no luck. I read a thread that suggested that it could be caused by the IMU. Tried to calibrate IMU but would not initiate. The drone was flown wo the camera board, could that cause this problem? Any ideas? Things to check?