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Question: MacOS High Sierra error during installation and now throws codes across screen. Cannot turn onsafe mode. What should I do?

How to fix a failed software installation update. MacOS High Sierra failed to install and now throws a code after each login attempt then reboots. Cannot get safe mode to work.

MacBook Pro, iOS 11.1

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Nov 16, 2017 2:57 PM in response to NickeeD811 In response to NickeeD811

Reinstall El Capitan or Later Without Erasing Drive


Please be sure you back up.


  1. Restart the computer. Immediately after the chime hold down the Command and R keys until the Utility Menu appears.
  2. Select Disk Utility and click on the Continue button.
  3. Select the indented (usually, Macintosh HD) volume entry from the side list.
  4. Click on the First Aid icon in the toolbar. Wait until the Done button activates, then click on it.
  5. Quit Disk Utility and return to the Utility Menu.
  6. Select Reinstall OS X and click on the Continue button.


Also, see this User Tip: Basic Steps for Upgrading OS X.

If you have no success with the above then:

Install El Capitan or Later from Scratch


Backup if possible before continuing.


  1. Restart the computer. Immediately after the chime hold down the CommandandRkeys until the Apple logo appears. When the Utility Menu appears:
  2. Select Disk Utility from the Utility Menu and click on Continue button.
  3. When Disk Utility loads select the volume (indented entry, usually Macintosh HD) from the Device list.
  4. Click on the Erase icon in Disk Utility's main window. A panel will drop down.
  5. Set the Format type to Mac OS Extended (Journaled.)
  6. Click on the Apply button, then wait for the Done button to activate and click on it.
  7. Quit Disk Utility and return to the Utility Menu.
  8. Select Reinstall OS X and click on the Continue button.



Nov 16, 2017 2:57 PM

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Question: MacOS High Sierra error during installation and now throws codes across screen. Cannot turn onsafe mode. What should I do?