USB device no longer recognised

I have a GoPro which was working fine on the Apple, I connected it to my sons Windows computer to edit some video, now when I plug it in to the apple it is not showing anywhere! Likewise the external hard drive I used on his computer to transfer the files is no longer recognised on the Apple.
I must be missing something? They are still there showing on the Windows computer.

Hello John79378,
Thanks for using Apple Support Communities.
To start troubleshooting this issue where your USB devices are not being recognized by your Mac, I'd like you to please follow the article linked to below.
USB and FireWire Quick Assist - Apple Support
Cheers,
Alex H.

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    Message was edited by: macjack

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