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Question: iMac (Retina 5K, 27-inch, Late 2015)

Problems loading macOS High Sierra. My computer is stuck on installing High Sierra. Its been stuck for hours with only a minute to go. My internet is slow but is there a solution to get out of this.

MacBook, OS X Mavericks (10.9.2)

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Nov 13, 2017 4:24 PM in response to Katyrou In response to Katyrou

I took my Mac Pro to a friends house and with fast internet had no issues but I can't do anything with to stop the installing and it is completely jammed.

Nov 13, 2017 4:24 PM

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Nov 14, 2017 4:56 PM in response to Kappy In response to Kappy

I'd like to say yes but no, it did go back to resume to down load High Sierra, I clicked resume, I got a message saying the program failed to down load and not it is back on the 'installing - less than a minute' and it has jammed again. I could close it all down again but where to from there.

Nov 14, 2017 4:56 PM

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Nov 14, 2017 7:44 PM in response to Katyrou In response to Katyrou

Well, you can follow this:


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 the above doesn't get you back to normal then you need to do this:

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 14, 2017 7:44 PM

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User profile for user: Katyrou

Question: iMac (Retina 5K, 27-inch, Late 2015)