My Passport for Mac Will Not Mount

I have a 4TB My Passport that I purchased in May 2019. It functions as my Time Machine drive. Up until yesterday, it was working fine. We had a brief power outage, and when the power was restored, the drive did not mount. I have tried unplugging it, restarting my Mac, shutting down my Mac–just about everything. The drive shows up in my Mac’s disk utility app, but it is greyed out. When I try to run “first aid”, I get a message that the drive is not accessible. Is this a hardware issue or something else?

When you connect an external hard drive on Mac, it will show up on Desktop, Finder, and Disk Utility. But sometimes the external drive won’t appear on any of these places. To fix the issue, you can try the below methods:

  1. Change MacOS settings
  2. Reset Mac firmware settings
  3. Fix external hard drive connectivity issue
  4. Troubleshoot external hard drive
  5. Recover data from non-mounting external mac hard drive using reliable data recovery software

Further, I suggest you to check the below link for detailed steps to be followed in each method above.

Hope it helps!