How To Erase & Factory Reset A Mac & Reinstall macOS

Somehow, your macOS operating system has become corrupted. Rather than troubleshooting the reason why, it is sometimes easier to just do a reinstall of Mac OS without losing data. If you have been targeted by malware or a virus, the core function of the macOS will be impacted. A reinstallation is required to remove the malware or virus completely. Reinstall Mac Operating System From The Recovery Partition Turn on the Mac and immediately press and hold down both the Command key and the R key. Once you see the Apple logo appear in the middle of the screen you can release the Command and R keys. But they’re also what you do if something really bad happens to the copy of OS X that you boot your Mac from, or if the version of OS X on your Mac is earlier than 10.10 El Capitan. In other words, these instructions describe the process for installing, reinstalling, or upgrading OS X El Capitan. Jul 24, 2018 · The problem may be that your Mac is trying to install a version of OS that was last installed on this particular computer. This may be an issue especially if this is a second had, used Mac. Please follow these steps: Start up your Mac in Internet Recovery Mode.

Sep 06, 2019

How to Reinstall macOS From Recovery Options - Mac Analyst

Jul 24, 2018 · The problem may be that your Mac is trying to install a version of OS that was last installed on this particular computer. This may be an issue especially if this is a second had, used Mac. Please follow these steps: Start up your Mac in Internet Recovery Mode.

Installing or Reinstalling OS X El Capitan (Only If You But they’re also what you do if something really bad happens to the copy of OS X that you boot your Mac from, or if the version of OS X on your Mac is earlier than 10.10 El Capitan. In other words, these instructions describe the process for installing, reinstalling, or upgrading OS X El Capitan.