Arduopilot boads help please

I have 4 ardupilot boards which I built and set up 24 hours ago, all where working with gps locked and was able to read serial data Lat Long in through ide.Today I connected the power to the board 1 and could only get a power led on board 1 and 2 and 3 board 4 power and mux. I am unable to reload any programs to the board programmer not responding. These units were all working and have not touched them until today. any suggestions whats going on please

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  • 3D Robotics

    Just so I'm clear, can you explain in more detail what the issue is with each of your 4 boards> 1: issue. 2: issue., etc..

    If you can't load code on any board, the problem is almost certainly your FTDI cable, drivers or Windows setup.

  • Are you powering the 4 boards in series? Or each one individually? What power supply do you use? What servo channel I/O have you connected? Finally, are you unplugging the gps when you try to upload code?
  • Power supply voltage low?

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