Macintosh HD and reinstallation
Hello, is there a way to reinstall the operating system on an iMAC when "Macintosh HD" in Disk Utilities is no longer appearing?
This has happened to me twice now. The other time it was on my MacBook and an AppleCare agent walked me through the steps to do a reinstallation, and unfortunately, those steps led to the disappearance of "Macintosh HD" and the computer was unable to reinstall anything. Now the same thing is a happening with my iMAC, following the instructions again, and the same thing has happened. This can't be a coincidence and hoping to get some answers or advice on how to retrieve the Macintosh HD in Disk Utilities, which was perfectly working before going through those steps.
iMac 21.5", macOS 10.14