I have the same problem on a 2014 iMac running Mojave. Its 3TB fusion main drive filled up as I was downloading a 5 GB file. The write failed to complete and immediately the disk became read-only.
Now no command in disk utility or in single user or recovery mode can escape read-only mode, so no repair or reformat or OS reinstall is possible. I see no ...
Re connecting a Mac mini 2018 to 30" Apple Cinema Display*:
* Apple Cinema Display 30" refers to TFT-LCD model (M9179LL/A) only! This does NOT work for the LED apple cinema displays.
You need the following:
Power Adapter of the Apple Cinema Display
The apple mini display port (mini DP) to Dual Link DVI adapter (sold second hand only, 30-150 USD) apple ...
If you have an bootable macOS installer USB (Here is how to make one), boot from the installer directly by holding Option Key.
The options would require having access to a Mac (VM or real)
Another option could be to install macOS on an external drive and boot from it(holding option while booting), and try to install macOS on the internal disk.
I will assume that your situation is like mine and most other at home: Your Mac mini and other computer is on a local network, you have a router and is connected to the internet using a service provider. Then there are four things needed to reach you mini from the internet.
1) The mac mini has to be "opened" for access. It seems you have done this already.
For private use, a product like TeamViewer could be used, but for a more integrated solution you would need more knowledge (which can be attained for free) to setup and maintain a server.
There used to be a simple solution using iCloud’s Back to my Mac, but that is phased out as far as I know. (https://support.apple.com/en-gb/HT208922)
Running a remote ...