Hi there I purchased a used P3 advanced that had a hard landing and the gimbal is not working (no image, no movement). Upon power up the gimbal LED flashes green but the gimbal doesn't move at all, then after about 10 seconds the LED goes out, and it seems to repeat this process. I'm wondering if a correctly functioning gimbal mainboard behaves this way when there is no ribbon cable attached to it? If so, it suggests my gimbal main board might be okay and the problem is elsewhere. Thanks!