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How do I format my IMAC and reinstall OS X?

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How do I format my IMAC and reinstall OS X?

Restart your Mac. Choose Apple menu > Shut Down, press and hold the power button until “Loading startup options” appears, select Options, click Continue, then follow the onscreen instructions. In the Recovery app window, select Reinstall for your macOS release, click Continue, then follow the onscreen instructions.

How do I manually install Mac OS X?

Install macOS

  1. Choose Reinstall macOS (or Reinstall OS X) from the utilities window.
  2. Click Continue, then follow the onscreen instructions. You’ll be asked to select your disk. If you don’t see it, click Show All Disks.
  3. Click Install. Your Mac restarts after installation is complete.

How do I get Mac OS X on my Mac?

Download Mac OS X

  1. Open the Mac App Store (choose Store > Sign In if you need to log in).
  2. Click Purchased.
  3. Scroll down to find the copy of OS X or macOS you want.
  4. Click Install.
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How do I install an operating system on an old Mac?

Restart your Mac while holding Option/Alt (depending on when it was made) to access Startup Manager. Select the bootable installer and click Enter. Your Mac should then open in Recovery mode. Click Reinstall macOS and wait for macOS Catalina to be installed on your machine.

How do I download OSX installer?

Downloading Mac OS X Installers from App Store “Purchases”

  1. Open the App Store.
  2. Go to the “Purchases” section (newer App Store versions must go to Account > Purchases)
  3. Scroll down the list of Purchased items to locate the Mac OS X Installer version you wish to re-download, then click on the download button.

Why can’t I install OSX on my Mac?

Some of the most common reasons macOS can’t complete the installation include: Not enough free storage on your Mac. Corruptions in the macOS installer file. Problems with your Mac’s startup disk.