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OS X Lion Fresh Install

When upgrading a Mac to Apple’s OS X Lion the new no-box-or-cd install left me searching for directions on how to do a fresh install instead of an upgrade. By default OS X Lion upgrades from Snow Leopard potentially leaving old OS cruft laying around.

The Install Mac OS X Lion App, which is what Apple gives you when you purchase Lion from the App Store, can be used to create a bootable DVD or USB drive. To create this copy the InstallESD.dmg file, from the Install Mac OS X Lion Package, onto a DVD or USB drive as this post describes. You can then boot off of the USB/DVD by holding the option key when restarting the computer.

If you no longer have the Lion Installer you can re-download it from the App Store. Open the App Store, browse to Lion, and click Installed button while holding the option key. This will allow you to re-download the installer as mentioned here.

If your computer is already running Lion and you want to do a fresh reinstall you do NOT need a bootable DVD or USB key. Simply hold down the option key on boot and you will be able to choose Lion Image as a boot option.

Good luck!

Dustin Tinney (39 Posts)

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2 Trackbacks

  1. By AhTim.com on October 14, 2011 at 4:21 am

    Confirm: OS X Lion run SLOWER !…

    Your mouse or keyboard input become unresponsive for 1-2 seconds some time, especially when switching between apps! Sad to hear my wife say its a lousy OS compare to Windows 7! I don’t believe it until I’ve try it…….

  2. By MacBook Watch on November 1, 2011 at 11:15 pm

    How to Create a Bootable OSX Lion Install Disk…

    OSX Lion is the first operating system to be offered as a full digital download. Initially Apple stated that the only way to get Lion was to download it from the Mac App store, but later decided to offer it on a bootable USB stick that you could purcha…