How do you reset a Mac lion?

Restart your Mac and hold down the Command + R keys until the Apple logo appears. From there, you’ll see an OS X Utilities window with the aforementioned options listed. Select Disk Utility and erase your HD, just as instructed to do in the first section of this article.

How do you do a hard reboot on a Mac?

From the keyboard: Hold down Control + Command + power button/eject button/Touch ID sensor. To force restart a MacBook Pro: Hold down the power button or Control + Option + Command + power/eject button.

How do I factory reset my IMAC 10.7 5?

How Do I Force A Factory Reset On My Mac? Immediately after restarting your computer, hold the Option, Command, P, and R keys together. Within 20 seconds, release the keys. Essentially, this clears out memory settings so that certain security features can be restored.

How do I restore my Macbook Air to factory settings without CD?

To do so, shut down your Mac, then turn it on and immediately press and hold four keys together: Option, Command, P, and R. You can release the keys after 20 seconds or so. That’s it! Your Mac’s NVRAM has been reset.

How do I force reset my computer?

Use Ctrl + Alt + Delete

  1. On your computer keyboard, hold down the control (Ctrl), alternate (Alt), and delete (Del) keys at the same time.
  2. Release the keys and wait for a new menu or window to appear.
  3. In the bottom right corner of the screen, click the Power icon.
  4. Select between Shut Down and Restart.

How do I restore my Mac to factory settings without disc?

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.

How do I reset my 2008 iMac?

Restart your iMac by clicking the Apple menu, then select Restart…. Click the Restart button when the dialog box appears. After the iMac shuts down completely but before it begins to restart, hold down the Command (⌘) and R keys at the same time.