The instructions offered here describe both the process for installing and the process for reinstalling OS X. Here’s how to install (or reinstall) OS X, step by step: Boot from your Recovery HD partition by restarting your Mac while holding down the cmd+R keys. The OS X Utilities window appears. Select Reinstall OS X, and click Continue.
Thus, reinstalling OS alone from Mac recovery mode doesn’t affect your data, files, user settings, apps, etc. It will only re-install the fresh copy of OS X on your Mac. If you are wondering how long does it take to reinstall OS X? Then, the short answer is it all depends on the speed of your internet connection and system. Reinstalling Mac OS X can seem daunting, but it's actually a relatively painless and wonderfully effective troubleshooting tool. CNET staff Sept. 2, 2009 1:28 a.m. PT The Mac operating system also includes various self-diagnosis and repair tools. Bear in mind, however, that these features might be susceptible to failure. When built-in tools or software-based solutions do not work, the last and most efficient solution is to reinstall the operating system. Step 4: Reinstall a clean Mac operating system. Restart your Mac. While the startup disc is waking up, hold down the Command+R keys simultaneously. Click on Reinstall macOS (or Reinstall OS X where applicable) to reinstall the operating system that came with your Mac. Click on Continue.
However, if you're reinstalling Office, you've already redeemed a product key, or you're installing Office at work or school and know you have a license, then go to the section sign in and install Office on your PC or Mac.
Jan 11, 2019 · Restart your Mac using one of the following keyboard commands: Command+R — this will reinstall the version of the OS that was most recently installed on your Mac. Command+Option+R — this will reinstall the latest version of the OS that is compatible with your Mac. 2. May 18, 2020 · Steps to Reinstall Mac OS Using Recovery Mode. The first step on how to reinstall Mac OS in recovery mode is to once again access macOS Utilities. However, you can uninstall and reinstall Mac OS X without having to wipe your drive. Instead of running Disc Utility, you can select “Reinstall macOS” right off the bat.
Apr 21, 2020 · When to Reinstall Mac Operating System? There are many situations under which Mac OS X needs to be reinstalled such as, damaged file system, Mac operating system crash, severe virus corruption, upgrading or downgrading Mac to latest versions like Catalina, Mojave or even High Sierra, etc. Option-Command-R installs the macOS that came with your Mac, or the closest version still available. Shift-Option-Command-R isn't available. from: How to reinstall macOS from macOS Recovery - Apple Support. If you was a more recent version, download that from within MacOS. Reinstall Mac OS. At times, you might find the need to reinstall your current MacOS system. While this is mostly used as a troubleshooting technique, there are many more reasons for reinstalling a High Sierra operating system. A clean install erases files from your mac, but a reinstall does not delete anything.