Have just got my bird back from repair, replacing two motors, an ESC and the GPS. Once it initialised, when I went to start the motors with the RC I got no response from the bird. I tried a few other joystick configurations (thinking I'd forgotten the right start-up procedure) and then all the LEDs stopped flashing and I got beep beep beep continuously. It's coming from all four motors and they're initially in sync sounding like one beep, but after a while, you can hear separate beeps from each motor. Now that's all it does when power is applied (after a brief yellow flash from the LEDs). The gimbal does not actuate and the PC does not recognise the bird when I plug it into a USB port. I've tried pressing the link button - nothing. I've taken the top off and had a good look for anything loose or broken - all looks good. Any thoughts appreciated.