If you need to reinstall Mac OS in order to sell it, you should consider erasing or formatting the startup disk. This step is necessary to clean your data, Apple ID and similar details. In some cases, macOS installer delivers a warning that OS cannot be installed on the computer or volume because startup disk is formatted incorrectly.

Sep 06, 2019 · Use a Mac OS X installation Disc. If you’re unable to use Internet Recovery Mode or create a bootable USB installer, you can still use a Mac OS X installation disc. These discs are available for OS X Snow Leopard, OS X Lion, and OS X Mountain Lion. If your Mac is from 2012 or earlier, there was an installation disc in the original box. 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 08, 2019 · How to erase all data on a Mac, how to factory reset a Mac, and how to reinstall macOS. This works for any Mac Including Macbook, Macbook Air, MacBook Pro, Imac, Imac Pro, Mac Pro, & Mac Mini Mar 27, 2018 · How to Format | Fresh Reinstall MAC OS on Macbook Pro, Macbook Air, OS DVD, Easiest way to format and fresh reinstall mac os on any mac (Macbook pro ,Macbook Air ,Retina,iMac,Mac mini, from OS dvd Mar 12, 2020 · Select Install macOS (or Install OS X) from the Utilities window, then click Continue and follow the onscreen instructions. Learn more For more information about the createinstallmedia command and the arguments that you can use with it, make sure that the macOS installer is in your Applications folder, then enter this path in Terminal:

Apple also offers Shift-Command-Option-R, which installs the version of OS X or macOS with which your computer shipped, or the next oldest compatible system still available for download.

Sep 13, 2015

How to Reformat Mac OS X Without a Recovery Disc or Drive

If you have a problem with your Mac and need to reinstal the operating system you should be able to simply reinstall macOS (or Mac OS X) via the Recovery partition. In this article we'll look at A Required Download Is Missing - Apple Community Nov 03, 2019 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.