While the upgrade process shouldn't cause any problems, it's always best to be prepared for the worst. If you use multiple monitors, be sure to have all of the monitors turned on.
OS X Mountain Lion for Mac - Download
During the installation, the progress window may display on the secondary monitor instead of your main monitor. You won't see the progress window if the display is turned off, and you may think something is going wrong with the installation.
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More importantly, if you can't see the progress window, you won't have any idea how long you have to wait before you can use your new OS. Your Mac will restart automatically once the installation is complete. This is where many people get worried because the first startup with OS X Mountain Lion can take a long time. Mountain Lion analyzes your Mac's hardware, fills data caches, and performs other one-time housekeeping chores. This startup delay is a one-time event.
The next time you start your Mac, it will respond as expected. This will check for updates of the OS and many supported products, such as printers, that are connected to your Mac and may need updated software to work correctly with Mountain Lion. Share Pin Email.
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Tom Nelson has written hundreds of articles, tutorials, and reviews for Other World Computing and About. He is the president of Coyote Moon, Inc. Updated December 17, A destination volume for the installation.
Basically, any bootable device will work, but because this is a guide to an upgrade install, the target volume must be running OS X Lion or earlier. If your Mac doesn't meet this requirement, then the Clean Install guide is a better choice for you. A minimum of 8 GB of free space; more space is better, of course. This is a hidden volume that is created during the installation.
The Recovery HD volume contains utilities to repair drives and to re-install the OS if you have problems with a drive. The download process also creates a Mountain Lion installer icon in the Dock for easy access and auto-starts the Mountain Lion installer.
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You can quit the installer if you're not ready to begin the installation process; otherwise, you can continue from here. Close any applications that are currently running on your Mac, including your browser and this guide. You can print the guide first by clicking the printer icon in the top right corner of the guide. The Mountain Lion installer window will open.
Reinstalling Mountain Lion
If you want to install Mountain Lion on a different drive, click the Show All Disks button, select the target drive, and click Install. The Show All Disks button is only visible if there are multiple drives connected to your Mac.
Move up to Mountain Lion without losing your personal data.
Enter your administrator password and click OK. The Mountain Lion installer will start the installation process by copying the necessary files to the selected destination drive, usually the startup drive. The amount of time this will take depends on how fast your Mac and the drives are.
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