When I power-up a pop-up says my USB plug-in overdrew power and other systems were shut down. How do I reboot?

When I power-up a pop-up says my USB plug-in overdrew power effecting other systems (webcam, microphone) shut down and are now unrecognised. How do I reboot so I may have access to these features?
Any help is much appreciated!

Do you have any USB devices attached to your machine? Other than those 'built into' the internal USB hub?
Clinton

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