How to Reset a MacBook Pro

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25-02-2018, 23:00
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Community Tested This wikiHow teaches you how to reset your MacBook Pro's NVRAM and battery settings, as well as how to wipe your MacBook Pro and restore it to its factory settings. Resetting a Mac's NVRAM can help fix errors in things like your battery's display, while battery settings can be reset if your Mac is frequently overheating or crashing. Restoring your MacBook Pro to its factory settings will erase everything on the hard drive and reinstall the operating system.

Resetting the NVRAM

  1. Understand what resetting NVRAM will fix. NVRAM—short for "Non-Volatile Random-Access Memory"—stores settings like speaker volume, the default display, and other settings that your Mac typically uses. Resetting the NVRAM can fix problems wherein your MacBook Pro isn't playing sound, the display is flickering or turning itself off, the computer is taking too long to start up, and similar problems.
    • On some Macs, "NVRAM" is replaced with "PRAM" ("Parameter Random-Access Memory"), which is fundamentally similar to NVRAM.
  2. Open the Apple menu . Click the Apple logo in the top-left corner of the screen. A drop-down menu will appear.
  3. Click Shut Down…. It's at the bottom of the Apple menu.
  4. Click Shut Down when prompted. Doing so prompts your MacBook Pro to shut down.
  5. Find the NVRAM reset keys. To reset NVRAM, you'll have to hold down the ⌘ Command, ⌥ Option, P, and R keys all at the same time for about 15 seconds.
  6. Turn back on your Mac. Press the "Power" button on your Mac to prompt your Mac to begin turning back on.
  7. Press and hold the NVRAM reset keys. Do this immediately after pressing your Mac's "Power" button; you'll need to be pressing all four keys at once before the Apple logo appears.
    • If the Apple logo appears before you press the keys, you'll have to shut down and try again.
  8. Continue holding the keys until your Mac finishes starting up. Your Mac may reboot itself during this process. Once you arrive at the user selection screen, you can release the keys and sign into your MacBook Pro like you usually do.
    • You may need to reset some of your preferences (e.g., preferred audio output) after resetting the NVRAM.
  9. Verify that the problem has been resolved. If you are still having issues with the system settings, you may need to factory reset your MacBook Pro. You will lose any data that you have saved on the MacBook if you do so.

Resetting the Battery

  1. Understand what resetting the battery will fix. To reset the battery, you'll actually reset the SMC (System Management Controller) which is a small chip that controls things like your Mac's external lights, responses to button presses, and battery management. Resetting the SMC may improve battery life, fix overheating problems, and speed up your MacBook Pro.
  2. Check the symptoms. There are several symptoms that are directly related to the SMC:
    • The fans are loud and running at high speed even though the computer isn't hot and is well-ventilated.
    • Indicator lights (battery, backlights, etc.) are not working properly.
    • The MacBook doesn’t respond to pressing the Power button.
    • The computer shuts itself down or goes to sleep unexpectedly.
    • The battery does not charge properly.
  3. Open the Apple menu . Click the Apple logo in the upper-left side of the screen. Doing so prompts a drop-down menu.
  4. Click Shut Down…. It's at the bottom of the drop-down menu.
  5. Click Shut Down when prompted. Your MacBook Pro will shut down.
  6. Attach your MacBook Pro to a plugged-in charger. Make sure that the charger is plugged into a wall outlet, then plug the charging end into the port on the right side of your MacBook Pro.
  7. Find the SMC reset keys. In order to reset the SMC, you'll need to hold down the ⌘ Command, ⌥ Option, and ⇧ Shift keys all at the same time while also holding down the "Power" button.
    • If your MacBook Pro has a touch bar, the "Power" button is also the Touch ID button.
  8. Press and hold the SMC reset keys for 10 seconds. Once you've done so, you can release the keys.
  9. Press the "Power" button. Doing so should turn on your Mac, prompting it to begin restarting. Once your Mac finishes restarting, your battery issues should be resolved.
  10. Verify that the problem has been resolved. If you are still having issues with the battery, you may need to factory reset your MacBook Pro. You will lose any data that you have saved on the MacBook if you do so.

Restoring Factory Settings

  1. Back up your Mac if possible. Since restoring your Mac to its factory settings will erase everything on your hard drive, it's a good idea to back up anything that you want to save before doing so.
    • If you can't log into your Mac or you're unable to run your Mac's Time Machine, skip this step.
  2. Open the Apple menu . Click the Apple logo in the top-left corner of the screen. A drop-down menu will appear.
  3. Click Restart…. It's near the bottom of the drop-down menu.
  4. Click Restart when prompted. Doing so will cause your Mac to begin restarting itself.
  5. Hold down the ⌘ Command and R keys at the same time. You'll need to do this immediately after clicking Restart.
  6. Release the keys when you see the Apple logo. Your MacBook will begin booting into the Recovery window. This process can take a few minutes to complete.
  7. Select Disk Utility. It's in the middle of the Recovery window.
  8. Click Continue. This button is in the bottom-right corner of the window. Doing so opens the Disk Utility window.
  9. Select your Mac's hard drive. Click the Mac's hard drive's name in the upper-left side of the Disk Utility window.
    • Your Mac's hard drive will be named "Macintosh HD" if you didn't rename it.
  10. Click the Erase tab. It's at the top of the Disk Utility window. A new window will open.
  11. Click the "Format" drop-down box. Doing so will open a drop-down menu.
  12. Click Mac OS Extended (Journaled). It's in the drop-down menu.
    • This is the basic disk format used for Mac hard drives.
  13. Click Erase. This button is in the bottom-right side of the window. Your Mac's hard drive will begin erasing itself.
    • The erasing process can take a few hours, so make sure that your Mac is plugged into a charger.
  14. Click Done when prompted. Your Mac should now be completely erased.
  15. Click Disk Utility. It's a menu item in the top-left corner of the screen. A drop-down menu will appear.
  16. Click Quit Disk Utility. This option is at the bottom of the drop-down menu. Clicking it takes you back to the Recovery window.
  17. Select Reinstall macOS. It's in the Recovery window.
  18. Click Continue. This option is in the bottom-right corner of the window. MacOS will begin downloading onto your computer.
    • You must have an Internet connection for MacOS to download onto your computer.
  19. Follow any on-screen prompts. Once MacOS finishes downloading, you'll be able to install and set up the operating system as though the Mac were brand-new.
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