This should restore the version of OS X originally pre-installed on the computer. If possible because it is three times faster than wireless. Note : You will need an active Internet connection. Be sure to select the correct drive to use if you have more than one. Mavericks : Select Reinstall Lion/Mountain Lion, Mavericks and click on the Install button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed. Click on the Options button, set the partition scheme to GUID then click on the OK button. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Partition tab in the DU main window.ģ. After DU loads select your newly installed hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Select Disk Utility from the main menu and click on the Continue button.Ģ. Wait patiently - 15-20 minutes - until the Recovery main menu appears.ġ. Restart the computer and after the chime press and hold down the COMMAND-OPTION- R keys until a globe appears on the screen. Install Mavericks, Lion/Mountain Lion Using Internet Recoveryīe sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive. That means you need to try and reformat your hard drive.

Mac os x utilities boot