I am trying to reinstall the OS (Sierra) on a computer through the Recovery Start Up option. The progress bar reaches the end and says "About -16 seconds remaining" and then nothing happens. How do I get the OS reinstalled? Late 2014 MacMini.
Earlier Mac models
See if this helps...
1. Start up from macOS Recovery
Option-⌘-R
Upgrade to the latest macOS compatible with your Mac.
APFS won't work for Sierra, Sierra needs MacOS Extended Journaled. High Sierra won't work fir APFS on earlier Macs.
What has often worked for others is to use this Restore Method instead of CMD+r keys...
Option-⌘-R
Upgrade to the latest macOS compatible with your Mac.
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Reinstall OS Sierra
