Reinstall mac os x lion clean

Re-enter your App Store credentials if required. Note that this may take up between 10 and 60 minutes, depending on your Internet connection speeds.

Explaining the Mac OS X Lion Clean Install

Do not start the installation process when your download finishes. Our goal is here to keep a soft copy of the installer and in the flash drive. Double-click InstallESD. This may take a minute or two. Plug in the flash drive into your Mac and launch the Disk Utility application.

You can do it quickly by searching via Spotlight. This will remove everything in the flash drive. Keep a backup of the files within if you still need them, then come back to this section. Once the flash drive is formatted, re-select the formatted USB drive from the left menu, and click the Restore tab. Do the following steps carefully:. First, a reboot! Then, select the Mac OS X on the right. Click the Erase button button and everything including files, applications, settings, etc in your Mac will be completely deleted.

The installer may display the progress bar on a display other than your usual main screen; if that display isn't on, you'll wonder what's happening.

When the installation of OS X Lion is complete, your Mac displays a Welcome window, which marks the start of the registration and setup process for Lion. However, it is better not to use the Migration Assistant at this point, opting instead for a clean installation of Lion. After you know Lion is installed and working correctly, run the Migration Assistant from the Lion installation to move any user data you need to the Lion disk.

Perform a Clean Install of OS X Lion on Your Mac

You can find the Migration Assistant in the Utilities folder inside the Applications folder. Registration is optional. You can click through the next two screens if you want. If you do fill in the registration information, some of the applications you use in Lion are pre-populated with appropriate data.


  • OS X Lion: How to Do a Clean Install.
  • How to Perform a Clean Install of OS X Lion on Your Mac.
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Specifically, Mail and Address Book will already have your primary email account information partially set up, and Address Book will have your personal entry already created. Enter your Apple account information, and click Continue to open a window that requests information. You aren't required to enter it. When you're finished, or if you prefer not to register, click Continue. Lion requires at least one administrator account to be set up. You can use the administrator account to perform most Lion housekeeping tasks, to create additional users, and to install any applications that require administrator privileges.


  • Explaining the Mac OS X Lion Clean Install.
  • Make Your Mac Feel Like New Again With a Fresh Install of OS X.
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The Lion Setup Assistant is just about done. The final step shows you how to use the new touch-based gesture system in Lion. Depending on the type of touch-based input device you have Magic Mouse, Magic Trackpad, or integrated trackpad , you see a description of how to scroll. That's it. You can start exploring Lion, but before you head off, use the Software Update service to ensure that you have all the latest patches, device drivers, and other undercover goodies your Mac may need to perform at its best.

Reinstall from macOS Recovery

From the Apple menu, select Software Update , and then follow the onscreen instructions. Share Pin Email. Tom Nelson has written hundreds of articles, tutorials, and reviews for Other World Computing and About. He is the president of Coyote Moon, Inc.

Proof of the Lion Clean Install

Updated November 24, The system requirements are: Click Continue in the window that opens. Scroll through the terms of use and click Agree. The Lion installer assumes you want to install Lion on the current startup drive.

Step 1: Download Lion From the Mac App Store

To select a different target drive, click Show All Disks and select the target disk from the list the disk you erased earlier. With the target disk highlighted, click Install. Enter your admin username and password to begin the installation process and click OK. Wait while the Lion installer copies the necessary files to the target disk.

How to reinstall macOS from macOS Recovery

When the copying is finished, you are prompted to restart your Mac. Click Restart. In the Welcome window, select the country or region where you use your Mac and click Continue.

How to do a clean install of OSX mountain lion from a DVD.

A list of keyboard styles displays. Select the type that matches yours and click Continue. Select Don't transfer now and click Continue. When prompted for the administrator account name, enter your name. Enter your shortname, which is a shortcut name used for the administrator account and the name of the account's home directory.

Shortnames cannot be changed, so be sure you're happy with the name you enter. You'll be living with it for a long time.