If you see USB Devices Disabled on your Mac
Drives, cameras, keyboards, hubs and other devices that plug into the ports on your Mac can request a limited amount of power.
If an external device isn’t recognised by your Mac and a message says that the device needs more power, the operation can't be completed or USB Devices Disabled, try these steps:
Disconnect and reconnect the external device to your Mac.
Connect your external device to a different port on your Mac.
If your external device is connected to a USB or Thunderbolt hub, connect your device directly to your Mac.
If your USB or Thunderbolt hub is self-powered, make sure that it’s connected to an AC adaptor.
If you still need help, contact Apple Support.
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