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   How do I reinstall Mac OS X?

   • If you’re reinstalling on a Mac laptop, plug in the power adapter. You can use macOS Recovery, the built-in recovery system on your Mac, to erase and reinstall macOS. In the Recovery app window, select Disk Utility, then click Continue. In Disk Utility, select the volume you want to erase in the sidebar, then click Erase in the toolbar.

   Erase and reinstall macOS - Apple Support

   support.apple.com/guide/mac-help/erase-and-reinstall-macos-mh27903/mac

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   How to reinstall macOS on Intel based Mac?

   • You can use the apps in macOS Recovery on an Intel-based Mac to repair your computer’s internal storage device, reinstall macOS, restore your files from a Time Machine backup, set security options, and more. Reinstalling macOS requires an internet connection. To connect to the internet, you can use a wireless or wired network connection.

   Use macOS Recovery on an Intel-based Mac - Apple Support

   support.apple.com/guide/mac-help/use-macos-recovery-on-an-intel-based-mac-mchl338cf9a8/mac

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   Should I install a new macOS Big Sur on a clean drive?

   • Generally, installing a new macOS Big Sur on a clean drive will give your Mac enough space to breathe. You’ll be less likely to experience common Big Sur problems and you’ll get a chance to keep only the data you really need. It’s like you bring the new furniture in an empty apartment instead of a cluttered one.

   How to do a clean install of macOS 11 Big Sur - Setapp

   setapp.com/how-to/clean-install-macos-big-sur

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   How do I reinstall Big Sur?

   • If you’re not ready to go celebrate because the installation didn’t work, you can try to reinstall Big Sur. All you have to do is restart your Mac and boot in Recovery Mode (Command + R), then click on Reinstall macOS. Hopefully, it works this time.

   How to do a clean install of macOS 11 Big Sur - Setapp

   setapp.com/how-to/clean-install-macos-big-sur

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   What if I can't install macOS from recovery?

   • If you can’t complete macOS installation from macOS Recovery, make sure that your Mac is connected to the internet,* and learn what to do if an error occurred while updating or installing macOS. If you still can’t install macOS from Recovery, contact Apple Support. * You need a broadband internet connection that uses DHCP over Wi-Fi or Ethernet.

   How to reinstall macOS - Apple Support

   support.apple.com/en-us/102655

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   How do I install Big Sur on my Mac?

   • Hit the Backup button (it looks like the Play button) to start the process. Starting November 12, you’ll be able to access the Big Sur installer in the Apple menu > About This Mac > Software update. Alternatively, you can download the installer from the Mac App Store. It’s free and effortless. But be careful, it’s important to not rush things here.

   How to do a clean install of macOS 11 Big Sur - Setapp

   setapp.com/how-to/clean-install-macos-big-sur

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2. Videos

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     How to reinstall macOS from macOS Recovery — Apple Support

     Aug 19, 2020

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     How To Reinstall macOS On ANY Mac

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     Reinstall MacOS and keep all of your data

     Sep 6, 2021

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3. support.apple.com › guide › mac-helpErase and reinstall macOS - Apple Support

   support.apple.com › guide › mac-help

   • Cached

   Erase and reinstall macOS on an Intel-based Mac without the Apple T2 Security Chip. You can use macOS Recovery, the built-in recovery system on your Mac, to erase and reinstall macOS.

4. support.apple.com › en-us › 102655How to reinstall macOS - Apple Support

   support.apple.com › en-us › 102655

   • Cached

   Sep 30, 2024 · How to reinstall macOS. Use macOS Recovery, your computer’s built-in recovery system, to reinstall the Mac operating system. Before you begin. Shut down your Mac. Start up from macOS Recovery. Reinstall macOS from Recovery. If you need help.

5. osxdaily.com › 2021/04/08 › clean-install-macos-big-surHow to Clean Install macOS Big Sur - OS X Daily

   osxdaily.com › 2021/04/08 › clean-install-macos-big-sur

   • Cached

   Apr 8, 2021 · Clean installing MacOS Big Sur 11 requires the following: Mac compatible with macOS Big Sur so that it can run macOS 11.x; MacOS Big Sur boot installer drive that has already been created and ready to use; Full Time Machine backup of all Mac data, or complete data backup using your method of choice

6. discussions.apple.com › thread › 252633524No disk showing to reinstall macOS - Apple Community

   discussions.apple.com › thread › 252633524

   • Cached

   Apr 5, 2021 · Open Disk Utility. Go to View>Show All Devices. Click your Internal SSD/HD (APPLE SSD or SAMSUNG SSD) or “Macintosh HD” Click Erase. In Format, Click on it, and select Mac OS Extended (Journaled) Click Erase to confirm. Close/quit Disk Utility and open the installer to try again.

7. support.apple.com › guide › mac-helpUse macOS Recovery on an Intel-based Mac - Apple Support

   support.apple.com › guide › mac-help

   • Cached

   You can use the apps in macOS Recovery on an Intel-based Mac to repair your computer’s internal storage device, reinstall macOS, restore your files from a Time Machine backup, set security options, and more. Reinstalling macOS requires an internet connection. To connect to the internet, you can use a wireless or wired network connection.

8. www.macworld.com › article › 668644How to clean install macOS | Macworld

   www.macworld.com › article › 668644

   • Cached

   Make a copy of the macOS installer on a USB stick, reformat your drive and then install the macOS onto your Mac from the installer. Use macOS Recovery to reinstall macOS via the web.

9. setapp.com › how-to › clean-install-macos-big-surHow to do a clean install of macOS 11 Big Sur - Setapp

   setapp.com › how-to › clean-install-macos-big-sur

   • Cached

   Nov 18, 2020 · There are two ways to install a new macOS: 1) run a regular upgrade via Apple’s main menu (replace your current macOS with Big Sur on your startup drive); 2) start from scratch and clean install macOS.