Brain not connecting

Trying to connect v5 to macbook via usb - get error USB accessory disabled. Unplug the accessory using too much power to re enable USB devices.
Does this sound like a bad brain port?

We have this problem every now and then our top was to fix this is

  1. Disconnect the battery
  2. Switch the cable or which port the USB is going into (I have 2 USB ports)
  3. Try a different brain.
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