Reinstall mac os x lion 10.7 how to#
Reinstall mac os x lion 10.7 install#
Reinstall mac os x lion 10.7 download#

Select Disk Utility.Īt the Disk Utility screen, make sure you have these selected: You’ll be taken to the OS X Utilities dialogue. Next up, we’ll attempt to remove everything from the current OS and reinstall a new copy of Mountain Lion.įirst, a reboot! Hold down the Option key as you restart and you’ll end up at the screen below. So we’ve downloaded a new copy of Mountain Lion and made it bootable in a flash drive. Once it’s done you’ll have yourself a flash drive with a bootable Mountain Lion.

Click the Restore button. Installation may take about 10 – 20 minutes.

Reinstall mac os x lion 10.7 install#

Drag “Mac OS X Install ESD” on the left menu to Source.Drag the formatted drive from the left menu to the Destination field.Next, we are going to create a bootable OS X Mountain Lion in the flash drive. Once the flash drive is formatted, re-select the formatted USB drive from the left menu, and click the Restore tab. Keep a backup of the files within if you still need them, then come back to this section. Note: This will remove everything in the flash drive. Select Mac OS Extended (Journaled) for the format.In Disk Utility, do the following 4 steps carefully: You can do it quickly by searching via Spotlight. Plug in the flash drive into your Mac and launch the Disk Utility application. Navigate to Contents > SharedSupport, then look for the filename “InstallESD.dmg”ĭouble-click InstallESD.dmg to open/mount it on your Desktop. Look for the file called “Install OS X Mountain Lion”, right-click and select Show Package Contents.

Reinstall mac os x lion 10.7 download#

Once your download is done, go to Finder > Applications. Our goal is here to keep a soft copy of the installer and in the flash drive. Create Bootable OS X Mountain Lionĭo not start the installation process when your download finishes. When you get back, we will look at how you can create a bootable copy of OS X Mountain Lion on your USB drive. Make sure that you won’t need any of the contents of the flash drive, if you do, keep a backup of it somewhere first. While you wait, get a coffee, a break and a USB drive with at least 8 GB capacity. Note that this may take up between 10 and 60 minutes, depending on your Internet connection speeds. If you’ve previously purchased a copy of Mountain Lion, don’t worry, you will not be recharged. Re-enter your App Store credentials if required. Look for OS X Mountain Lion, hold down the Option key and click Download. Launch App Store, and go to the Purchases tab. Here’s how you can download and obtain a soft copy of Mountain Lion.

The installer you downloaded fro the App Store automatically deletes itself after you’ve successfully upgraded your Mac. Re-Download Mountain Lionįirst, grab hold of a copy of the Mountain Lion installer file.

Reinstall mac os x lion 10.7 how to#

Recommended Reading: How to Clean Install OS X Mavericks 1.

Make a bootable drive of Mac OS X Mountain Lion with a USB drive.

Download a copy of Mac OS X Mountain Lion.

Here is a breakdown of the steps involved: With that cleared up, in this article we will show you how to erase existing data and reinstall a brand new copy of Mountain Lion. A clean install will give you peace of mind. Two, you are thinking about trading or gifting your machine to someone else, but you are concerned with the remnants of files, profiles and various credentials that if mishandled, may lead to a security leak. To optimize your Mac, it is quite necessary to reinstall and start from a clean slate. Here are couple of reasons we can think of: One, your existing Mac OS X inherited documents, files and applications that take up a lot of unnecessary storage space. But first, why should you clean install the Mac OS X Mountain Lion at all? Unfortunately in Mac the process can be a little more complicated and less well known. In the Windows’ analogy, this is like reformatting your Macbook or iMac and reinstalling a brand new version of Mac OS X Mountain Lion.