This also happens when the battery is low and when the Macbook is not connected to it's charger. Try connecting the Macbook to a Charger and then connect the lightning cable. This has helped a lot of times for me.
This also happens when the battery is low and when the Macbook is not connected to it's charger. Try connecting the Macbook to a Charger and then connect the lightning cable. This has helped a lot of times for me.