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Your USB port may need additional software support. Make sure that you have the proper software.If you have a device with more than one USB port, try other ports as well. You may also want to check to see if your USB hub needs its own power supply. Make sure that the USB device is properly powered and that all connections are secure. Check power, cable, and port connections.If it works, the problem may be with your Mac. If you are able, try the hub with the same make and model as your device. Try your USB hub with another computer.Wait about a minute, plug everything back in, and use the power button to turn your Mac back on. After your device shuts down, remove the power cord from your outlet and device. Go to the Apple menu  and select Shut Down. How to check your USB hub for your MacBook.