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I had new software installed on my Mac. Unfortunately, at the end it throws an error and I have the only option to count restart and connect to another computer as a hard drive. I tried booting from backup and nothing. Please advise what to do with it. 😔
[Re-Titled By Moderator]
MacBook Air 13″, macOS 10.12
Boot into Restore mode,CMD+r keys...
Look at top of screen for Utilities menu...
In Disk Utility>View, select Show all Devices, highlight the top left entry.
Run Disk First Aid on all items in the left panel, from top down.
One repaired reinstall the OS.
What to do when my Mac won't start after installing new macOS?
