Why can’t I reinstall iOS after shutting down the Mac now I can’t do anything and it doesn’t work anymore I’m stuck
I can’t reinstall Mac OS after its been shutdown and now I can’t use it or return back
MacBook Air 13″, macOS 10.14
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Your question is unclear.
What problem were you having that prompted you to take any action that put you in this position?
Are you having trouble getting your Mac to restart?
What happens when you press the power button?
If your Mac doesn't turn on - Apple Support:
https://support.apple.com/en-us/HT204267
To reinstall macOS, you must restart you Mac in Recovery mode. Restart the Mac, and when you hear the startup chime immediately press and hold the Command-R (⌘R) keys until you see the Apple logo and progress bar.
How to reinstall macOS - Apple Support:
https://support.apple.com/en-us/HT204904
Please take a look at this article:
Writing an effective Apple Support Communities question - Apple Community