Wipe and Reinstall macOS

General Information

Note: This process will remove all files, content, and settings from the computer. A backup of any crucial information should be performed before proceeding with this article.

Important Terms

  • macOS – Macintosh’s Operating System. To find out what version of macOS your computer is running, go to Apple > About This Mac.

Hardware Requirements

In order to Internet Restore a Mac, it must meet the following criteria:

  • Desktops
    • iMac (21.5-inch, Mid 2011 or newer)
    • iMac (27-inch, Mid 2011 or newer)
    • Mac Mini (Mid 2010 or newer)
  • Laptops
    • MacBook (13-inch, Mid 2010 or newer)
    • MacBook Air (11-inch, Late 2010 or newer)
    • MacBook Air (13-inch, Late 2010 or newer)
    • MacBook Pro (13-inch, Early 2011 or newer)
    • MacBook Pro (15-inch, Early 2011 or newer)
    • MacBook Pro (17-inch, Early 2011 or newer)

Any models that are not in the list above are not compatible and should be sent to Property Surplus.

Apple Internet Recovery

Boot to Internet Recovery

  1. Make sure the Mac is completely shut down and connected to hard-wired ethernet.
  2. Press the power button and then immediately hold down Command+Option+R keys until a spinning globe icon appears.

If the globe icon does not appear, the most likely cause is that the key combination was either not pressed quickly enough, or was released too soon. You can shut the machine down by holding the power button for at least 10-seconds and retrying the steps above.

Erase Hard Drive

  1. Click Disk Utility.
  2. Click Continue.
  3. On the toolbar of Disk Utility, click the View drop-down.
  4. Click Show All Devices.
  5. In the left column, locate the Internal section.
  6. Select the top-most, non-indented option. This will usually have a name similar to “APPLE SSD SM025…”.
    1. Note: If you do not see an Internal section or do not see any drives under the Internal section, the hard drive my have hardware problems. An EERS work order should be submitted for the bad hard drive.
  7. On the toolbar, click Erase.
  8. In the Name field, input Mac HD.
  9. In the Format field, select APFS.
    1. Note: If APFS is not an option, select Mac OS Extended (Journaled) instead.
  10. In the Scheme field, select GUID Partition Map.
  11. Click Erase. The hard drive will begin to erase all data, including the Operating System, software, and user information from the drive.
  12. Click Done.
  13. A the top-left, next to the Apple, click Disk Utility > Quit Disk Utility.

Reinstalll Operating System

  1. Click Reinstall macOS.
  2. Click Continue.
  3. Click Continue.
  4. Click Agree.
  5. Click Agree.
  6. Select the Macintosh HD icon.
  7. Click Install. The Operating System will begin to install and the computer may reboot several times.

Apple Setup Assistant

If the Mac is connected via a hard-wired Ethernet, do not click on anything. The Setup Assistant will automatically progress through the enrollment.

If you are connected via Wi-Fi, you will need to:

  1. Select United States.
  2. Click Continue.
  3. Select U.S.
  4. Click Continue. The Remote Management or Configuration Available screen may appear to be frozen while it processes.
  5. At the Time Zone screen, check Set time zone automatically using current location.
  6. Click Turn on Location Services. If you receive an error that the computer cannot determine your location, it can be ignore.
  7. Click Continue.

First Log In

  1. Click Other.
  2. In the username field, type: completesetup
  3. In the password field, type: setup
  4. Hit Enter.

After a few moments, the Mac Registration app will launch.

Mac Registration

  1. On the Mac Registration app, click Register.
  2. Fill out all of the fields:
    1. Assign to User – This should be FirstName.LastName of the person who will oversee the Mac.
    2. Computer SAP Number – This should be computer’s 8-digit SAP number (not the user’s SAP number).
    3. Location – Select the school or department that the user belongs to.
    4. Computer Role – If the Mac is to be used by staff members, select Staff. If the Mac is to be used by students, select Students.
  3. Click Register.

The app will install required software and settings. Once it is complete, it will reboot the computer. After the reboot, the user can now log in with their network credentials.