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Your computer should then install the latest version of OS that it can install.
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Press Erase Volume Group if it’s available. Select the target hard drive to re-install OS X onto (typically Macintosh HD but varies per user) if the Mac has a FileVault password set choose to Unlock and enter the FileVault encryption password before proceeding further. Type in Macintosh HD as a name for the reformatted disk and choose a format. Once the Mac is connected to the internet, from the OS X Utilities screen choose Reinstall OS X. Select the startup disk and go to the Erase Tab. Shift + Option + Command + R: Boot into Recovery Mode to install the macOS version that shipped with your Mac or the closest available version. Select Macintosh HD, or whatever your boot drive is called, from the list in the sidebar.Select " Disk Utility" and click on Continue.Turn your Mac on, while holding the CMD + R keys down.Also, it is advised to make a time machine back up of your computer if possible before following the procedure. To reinstall your Mac's OS without an installation disc you need to firstly make sure that you keep your Mac turned on during the whole procedure, and that your Mac is connected to the internet.
#HOW TO FORMAT THE MAC OS AND REINSTALL IT HOW TO#
In this article we will show you how to reinstall Mac OS without disc. Sometimes it’sdue to wear and tear but it can also be something as simple as your hard-drivefilling up with files which are no longer needed. MacOS includes a recovery partition that allows you to easily erase all data on your Mac and reinstall your OS without an installation disc. It’s a fact of life that computers slow down.