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My MacBook Air won't shut down when an external hard drive is connected. The screen goes black, and the mouse pointer is still there. I think this started happening when I upgrade to Yosemite. Any suggestions as to how I might fix this?

  • Just curious. Do you use products from AVID or X-Rite? – howdytom Feb 15 '18 at 16:03
  • No -- this problem ended up fixing itself, as it happens; either that or I stopped using external HDDs habitually. Are you having a similar issue? – Jim Feb 17 '18 at 13:24
  • Yes, in my case it turned out a process called “hasplmd” which caused random Kernel Panics and prevented macOS Sierra from going to sleep/shutdown. I have shared a article about it here medium.com/@howdytom/… – howdytom Mar 11 '18 at 23:10
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Are you sure something is not still running...or something is preventing the disk from unmounting.

If there's a grey circle -- then it might be running fsck on the disk...

Now, another thread suggested:

Start Up in Verbose Mode using Command-V

Then issue: sudo shutdown -h now

Also, more /var/log/system.log

This should show you what's occurring as it shuts down.

The sudo shutdown -h now is equivalent to the Shut down menu option.

Also, try going into Disk Utility and manually click on the Unmount icon. I would just want to see if it will unmount normally.

If it doesn't, then, I'm thinking SOMETHING is still using the disk..

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