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- Reinstalling Mountain Lion
Upgrading from Mac OS X 10.7 (Lion)
OS X Mountain Lion for Dummies by Bob LeVitus and Bob Levitus (2012, Paperback). Apple Mac OS X 10.7, Lion Operating System Software. Apple Mac OS X 10.7, Lion. On July 25, 2012 Apple released Mountain Lion (OS X 10.8) as an upgrade to its operating system. Mountain Lion reportedly has over 200 new features, and is available through the Mac App Store for $19.99.
Mac OS X 10.8 (Mountain Lion) is no longer available for purchasefrom the Mac App Store. If you have Mac OS X 10.7 (Lion), and yourcomputer meets the systemrequirements for OS X 10.11 (El Capitan), you can upgrade directlyto that version instead; see ARCHIVED: Install or upgrade OS X 10.11 (El Capitan)
Reinstalling Mountain Lion
To reinstall or recover Mountain Lion, you must have an activeInternet connection. If you are on campus at Indiana University,UITS recommends the wired Ethernet network instead ofwireless. However, if IU Secure is your only option, seeConnect to an IU wireless network in macOS if booted from your Recovery HD
Reinstalling while keeping files, applications, and settings
- Restart your computer, and immediately hold down
command-r
until the gray Apple logo appears. - If prompted, select your main language and then click the arrow.
- Click Reinstall OS X, and then Continue. Follow the instructions on the screen, and then choose your hard disk. Click Install, and enter your Apple ID information if prompted.
- When the installation is complete, select App Store... from the Apple menu, and install any available updates.
Reinstalling while erasing everything on your computer
- Restart your computer, and immediately hold down
command-r
until the gray Apple logo appears. - If prompted, select your main language and then click the arrow.
- Click Disk Utility, and then Continue.
- In Disk Utility, from the left column, click your harddisk. Select the Erase tab.
- Next to 'Format:', make sure Mac OS Extended (Journaled)is selected. Next to 'Name:', give your disk a name.
- If you would like to securely erase your data, click SecurityOptions..., adjust the slider accordingly, and clickOK. When you're ready, click Erase..., andthen Erase again to erase your disk. When the processcompletes, quit Disk Utility.
- Click Reinstall OS X, and then Continue. Followthe instructions and then choose your hard disk. ClickInstall and enter your Apple ID information if prompted.Once the installation is complete, you'll be asked to enter basicinformation and have the option to transfer data from another computeror a backup.
- Select Software Update... from the Apple menu and installany available updates.
Apple today (July 25, 2012) announced that OS X Mountain Lion, the ninth major release of the world’s most advanced desktop operating system, is available as a download from the Mac App Store.
With more than 200 innovative new features, Mountain Lion includes iCloud integration, the all new Messages app, Notification Center, system-wide Sharing, Facebook integration, Dictation, AirPlay Mirroring and Game Center. Mountain Lion is available as an upgrade from Lion or Snow Leopard.
“People are going to love the new features in Mountain Lion and how easy it is to download and install from the Mac App Store,” said Philip Schiller, Apple’s senior vice president of Worldwide Marketing.
“With iCloud integration, Mountain Lion is even easier to set up, and your important information stays up to date across all your devices so you can keep editing documents, taking notes, creating reminders, and continue conversations whether you started on a Mac, iPhone or iPad.”
With more than 200 innovative new features, Mountain Lion includes:
Features
- iCloud integration, for easy set up of your Mail, Contacts, Calendar, Messages, Reminders and Notes, and keeping everything, including iWork documents, up to date across all your devices.
- the all new Messages app, which replaces iChat and brings iMessage™ to the Mac, so you can send messages to anyone with an iPhone, iPad, iPod touch or another Mac.
- Notification Center, which streamlines the presentation of notifications and provides easy access to alerts from Mail, Calendar, Messages, Reminders, system updates and third party apps.
- system-wide Sharing, to make it easy to share links, photos, videos and other files quickly without having to switch to another app, and you just need to sign in once to use third-party services like Facebook, Twitter, Flickr and Vimeo.