I almost completed the ArduSub initial setup with exception of ‘‘Configuring motor directions’’. When i power up my ROV I do not get any signals and QGroundControl wont find my device. The FAThOM -X tether interface onboard the ROV does not light up and my raspberry pi wont either. The pixhawk lights up. I use the micro USB-port to power my rasberry pi. What might be wrong? The output voltage from the Ubec voltage regulator is 0V.