MacOSX Lion - Reinstall your OS without installation disc

October 2016

MacOSX Lion includes a recovery partition allowing you to easily erase all data on your Mac and reinstall your OS.

  • keep your Mac powered, during the whole procedure
  • your Mac must be connected to the internet

The procedure is as follows:
  • Turn your Mac on, while holding the CMD + R keys down
  • Select "Disk Utility" and click on Continue.
  • Select the startup disk and go to the Erase Tab.
  • Select the Mac OS Extended (Journaled), give a name to your disk and click on Erase.
  • Disk Utility > Quit Disk Utility.
  • Re-install MacOSX: click on "Reinstall Mac OS X" > "Continue".
  • Follow the on-screen instructions.

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