This should install the version of OS X that was installed. I suggest using Ethernet if possibleīecause it is three times faster than wireless. Note : You will need an active Internet connection. Reinstall OS X: Select Reinstall OS X and click on the Install button. The Erase button and wait until the process has completed. The Security button and set the Zero Data option to one-pass. I tried to reinstall Mac OS but it quits with this message: macOS could not be installed on your computer. I started in the recovery mode, used disk utility first aid to repair the disk. When I woke up the Pro in the morning, it would not accept my login password. Set the format type to Mac OS Extended (Journaled.) Optionally, click on I have the 750GB SSD on my mid-2013 MACBOOK PRO. Click on the Erase tab in the DU main window.ģ. After DU loads select your startup volume (usually Macintosh HD) from the Select Disk Utility from the main menu and click on the Continue button.Ģ. Select the Recovery HD and click on the downward pointing arrow button.ġ. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. To explore the Disk Utility User Guide, click Table of Contents at the top of the page, or enter a word or phrase in the search field. You need to erase the disk then reinstall OS X:īe sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive. If you’re having problems with a disk, Disk Utility can check the disk and repair problems it detects.
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