I suggest using Ethernet if possible because it is three times faster than wireless. Note : You will need an active Internet connection. Reinstall Lion: Select Reinstall Lion/Mountain Lion and click on the Install button. ![]() Click on the Erase button and wait until the process ![]() Set the format type to Mac OS Extended (Journaled.) Optionally, click on the Security buttonĪnd set the Zero Data option to one-pass. After DU loads select your startup volume (usually Macintosh HD) from the left side list.Ĭlick on the Erase tab in the DU main window.ģ. 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. Install or Reinstall Lion/Mountain Lion from Scratchīe sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
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