So I have brought my Phantom Vision (original no gimbal) out of retirement. It has a GPS issue due to a previous incident. I will be happy to fly it atti mode. Now when I start her up she flashes yellow slowly to represent atti mode, but the motors wont start. All controls seems to working in the assistant software. Interesting I cannot activate a compass calibration by moving the S1 switch numerous times, however when looking at the assistant software the switch moving is detected fine. Any thoughts? I did an advanced calibration with software and no change.