Reinstall mac operating system lion
You may need to create a new partition to install to or resize existing partitions to create the necessary space. If you need instructions for adding, formatting, or resizing a drive's partitions, you can find them here: Before you start the Lion installer, close all other applications that are currently running on your Mac. After your Mac restarts, the installation process continues.
A progress bar displays along with an estimate of the time it will take to complete the installation. Installation speed ranges from 10 to 30 minutes. If you have multiple displays connected to your Mac, turn all of them on before you begin the Lion installation process. 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.
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.
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- Install OS X Lion Using a Bootable DVD.
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- Perform a Clean Install of OS X Lion on Your Mac.
- install - How can I reinstall Mac OS X (Lion) without erasing data? - Ask Different?
- How to Perform a Clean Install of OS X Lion on Your Mac?
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If you do fill in the registration information, some of the applications you use in Lion are pre-populated with appropriate data. 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.
Reinstall from macOS Recovery
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. The Lion Setup Assistant is just about done.
Reinstalling Lion
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.
From the Apple menu, select Software Update , and then follow the onscreen instructions.
The Safe Mac » How to reinstall Mac OS X from scratch
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. 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. 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.
ARCHIVED: How do I install OS X 10.8 (Mountain Lion)?
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.
If you need to erase your disk before installing macOS, select Disk Utility from the Utilities window, then click Continue. You probably don't need to erase, unless you're selling or giving away your Mac or have an issue that requires you to erase. Learn more about when and how to erase. If your Mac restarts to a setup assistant, but you're selling or giving it away, press Command-Q to quit the assistant without completing setup. Then click Shut Down.
How to reinstall macOS from macOS Recovery
When the new owner starts up the Mac, they can use their own information to complete setup. Decide whether to erase format your disk If you need to erase your disk before installing macOS, select Disk Utility from the Utilities window, then click Continue.
Click Continue, then follow the onscreen instructions to choose your disk and begin installation. If the installer asks to unlock your disk, enter the password you use to log in to your Mac. Please allow installation to complete without putting your Mac to sleep or closing its lid. During installation, your Mac might restart and show a progress bar several times, and the screen might be empty for minutes at a time.
If you never installed macOS Sierra This combination makes sure that the installation isn't associated with your Apple ID, which is important if you're selling or giving away your Mac.