What to do when my Mac won't start after installing new macOS?
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