WD MyBook 3tb not opening on mac

Hello astuart911, welcome to the WD Community. Sorry to hear you cannot access your files. As a troubleshooting step, try connecting the My Book power cable directly to the wall and use another USB cable of possible. You can open the Disk Utility app and verify if it is recognized there, from here you can try to repair the drive. Check the link below for more information. 

How to test a drive for defects or problems on a Mac

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