How do I reinstall OS X Mountain Lion without disk?

Boot to the Recovery Volume (command – R on a restart or hold down the option key during a restart and select Recovery Volume). Run Disk Utility Verify/Repair and Repair Permissions until you get no errors. Then reinstall the OS.

How do I reinstall Mac OS X Lion?

Reinstalling Lion

  1. Restart your computer, and immediately hold down command-r until the gray Apple logo appears.
  2. If prompted, select your main language and then click the arrow.
  3. Click Reinstall OS X, and then Continue.

How do I manually reinstall Mac OS X?

Reinstall macOS

  1. Install the latest version of macOS compatible with your computer: Press and hold Option-Command-R.
  2. Reinstall your computer’s original version of macOS (including available updates): Press and hold Shift-Option-Command-R.

How do I reinstall Mac OS X on an old Mac without recovery mode?

Restart your Mac while holding down the ‘Option+Command+R’ keys. Release these keys as soon as you see the Apple logo. Once your Mac boots, you should see a spinning globe and the message ‘Starting Internet Recovery.

How do I reinstall OSX without disk?

Reinstall Your Mac’s OS Without an Installation Disc

  1. Turn your Mac on, while holding the CMD + R keys down.
  2. Select “Disk Utility” and click on Continue.
  3. Select the startup disk and go to the Erase Tab.
  4. Select the Mac OS Extended (Journaled), give a name to your disk and click on Erase.
  5. Disk Utility > Quit Disk Utility.

How do I restore my Mac without a startup disk?

How to use Internet Recovery to reinstall macOS

  1. Shut down your Mac.
  2. Hold down Command-Option/Alt-R and press the Power button.
  3. Hold down those keys until you a spinning globe and the message “Starting Internet Recovery.
  4. The message will be replaced with a progress bar.
  5. Wait for the MacOS Utilities screen to appear.

How do I reinstall OSX without disc?

How do I reinstall Mac OS after wipe?

Restart your Mac. Choose Apple menu > Shut Down, press and hold the power button until “Loading startup options” appears, select Options, click Continue, then follow the onscreen instructions. In the Recovery app window, select Reinstall for your macOS release, click Continue, then follow the onscreen instructions.

Select “Reinstall Mac OS X “ from the Mac OS X Utilities dialog followed by the “Continue” button. Select the drive or volume you want to reinstall Lion on and follow the onscreen instructions to complete the installation. Note: This option requires an internet connection in order to download the OS from the Apple servers.

How to reinstall Mac OS without an installation disc?

Reinstall Your Mac’s OS Without an Installation Disc. Select “Disk Utility” and click on Continue. 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.

What’s the best way to reinstall OS X?

Steps Hold down the “Command” and “R” keys while your Mac is booting. Select “Recovery HD” when prompted and click the arrow below it to boot into recovery mode. Select “Reinstall Mac OS X “ from the Mac OS X Utilities dialog followed by the “Continue” button.

How do you erase a disk on a Mac?

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.