How do I reinstall IOS on my Mac?

How do I reinstall IOS on an old imac?

Here are the steps Apple describes:

  1. Start up your Mac pressing Shift-Option/Alt-Command-R.
  2. Once you see the macOS Utilities screen choose the Reinstall macOS option.
  3. Click Continue and follow the on-screen instructions.
  4. Select your startup disk and click Install.
  5. Your Mac will restart once the installation is complete.

How do I reinstall Mac OS manually?

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 do a clean install of IOS on Mac?

Step 4: Wipe your Mac

  1. Connect your boot drive.
  2. Start up – or restart – your Mac while holding down the Option key (also known as Alt). …
  3. Choose to install your chosen version of macOS from the external drive.
  4. Select Disk Utility.
  5. Select your Mac’s start up disc, probably called Macintosh HD or Home.
  6. Click on Erase.

How do I reinstall IOS on my Mac without losing data?

How to Update & Reinstall macOS Without Losing Data

  1. Start up your Mac from macOS Recovery. …
  2. Select “Reinstall macOS” from the Utilities Window and click “Continue”.
  3. Follow the onscreen instructions to select the hard drive you want to install the OS on and start the installation.

Is my Mac too old to update?

Apple said that would run happily on a late 2009 or later MacBook or iMac, or a 2010 or later MacBook Air, MacBook Pro, Mac mini or Mac Pro. … This means that if your Mac is older than 2012 it won’t officially be able to run Catalina or Mojave.

Will I lose data if I reinstall macOS?

2 Answers. Reinstalling macOS from the recovery menu does not erase your data. However, if there is a corruption issue, your data may be corrupted as well, its really hard to tell. … Reinatalling the os alone does not erase data.

How do you reset a macOS?

To reset your Mac, first restart your computer. Then press and hold Command + R until you see the Apple logo. Next, go to Disk Utility > View > View all devices, and choose the top drive. Next, click Erase, fill out the required details, and hit Erase again.

How do I boot my Mac into recovery mode?

Reboot your Mac. Hold down Option/Alt-Command-R or Shift-Option/Alt-Command-R to force your Mac to boot into macOS Recovery Mode over the internet. This should boot the Mac into Recovery Mode.

How do I restore factory settings on my MacBook air?

How to reset a MacBook Air or MacBook Pro

  1. Hold down the Command and R keys on the keyboard and turn on the Mac. …
  2. Select your language and continue.
  3. Choose Disk Utility and click Continue.
  4. Choose your startup disk (named Macintosh HD by default) from the sidebar and click the Erase button.

How do I do a fresh install of OSX Catalina?

How to Clean Install MacOS Catalina

  1. Complete a full Time Machine backup before beginning – do not skip making a full backup.
  2. Connect the MacOS Catalina installer drive to the Macs USB port.
  3. Reboot the computer.

How do I repair a Mac installation?

Repairing a disk

  1. Restart your Mac, and press Command + R, while it’s restarting.
  2. Select Disk Utility from the macOS Utilities menu. Once Disk Utility has loaded, choose the disk you wish to repair – the default name for your system partition is generally “Macintosh HD”, and choose ‘Repair Disk’.

What happens if you reinstall macOS?

2 Answers. It does exactly what it says it does–reinstalls macOS itself. It only touches operating system files that are there in a default configuration, so any preference files, documents and applications that are either changed or not there in the default installer are simply left alone.

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