Mac Won’t Boot/Start After High Sierra Update? Here’s the Fix


Many Apple users have a complaint that their MacBook Pro won’t boot after High Sierra update. Here I am going to give the solutions to fix this issue. If you have the same issue, this article will help you to fix it.
Solution 1: Force Reboot

  1. Press and hold the Power Button until your Mac turned off.
  2. Wait for few seconds and then press the Power Button to turn it on.

Solution 2: Reset NVRAM/PRAM

  1. Turn off your Mac via Apple menu->Shut Down.
  2. Press the Power Button to turn on your Mac.
  3. Then immediately press and hold the Option + Command + P + R keys simultaneously as quickly as possible after pressing the Power Button.
  4. Keep pressing until you hear the startup sound for the second time.

Solution 3: Reset SMC
Disconnect all cables connected with your Mac.
If your Mac has a non-removable battery,

  1. Shut down your Mac via Apple menu->Shut Down.
  2. Press and hold the Shift + Control + Option + Power Buttons simultaneously.
  3. Then release the keys at the same time.
  4. Turn on your Mac by pressing Power Button.

If your Mac has a removable battery,

  1. Shut Down your Mac.
  2. Remove the battery out of your Mac.
  3. Press and hold the Power Button for 5 seconds.
  4. Insert the battery into your Mac.
  5. Turn on your Mac by Pressing Power Button.

Solution 4: Restart your Mac in Safe Mode (Safe Boot)
Restart your Mac in Safe Mode will fix many issues on your Mac. But you can’t use some features in Safe Mode.

  1. Turn off your Mac via Apple menu->Shut Down.
  2. Turn on your Mac.
  3. Press and hold the Shift Key as quickly as possible after you hear the startup sound. You can see the Apple Logo on the Screen.
  4. Keep pressing the Shift Key until you see the Login Window.
  5. Enter your User Name & Password to login. You may need to login twice if FileVault is turned on.
  6. If your Mac boot up in Safe Mode, check for update via Apple menu->System Preferences->App Store->Show Updates. Then Download and Install available updates.

Solution 5: Fix disk errors in Recovery Mode

  1. Turn off your Mac via Apple menu->Shut Down.
  2. Press Power Button.
  3. Press and hold the Command + R keys simultaneously as soon as possible after pressing the Power Button until the Apple Logo appears.
  4. After that Utilities windows will appear with 4 options. Tap “Disk Utility”.
  5. Tap “Continue”.
  6. Select the disk/drive that you want to repair.
  7. Select First Aid->Run. This action will check the disk for errors.
  8. Click “Done”. Close Disk Utility.
  9. Restart your Computer via Apple menu->Restart.

Solution 6: Reinstall High Sierra

  1. Turn off your Mac and press the Power Button to turn it on.
  2. Press and hold the Command + R keys simultaneously as soon as possible after pressing the Power Button.
  3. Keep pressing Command + R keys until the Apple Logo appears.
  4. After that Utilities windows will appear with 4 options. Tap “Reinstall macOS”.
  5. Tap “Continue”.
  6. You will be prompted to choose your disk. If you are not asked to select your disk, tap “Show All Disks”. You may need to enter your Apple ID.
  7. Tap “Install”. Wait until the installation process is completed. Your Mac will restart after completing the installation.

SEE ALSO: High Sierra Slow Graphics Performance
Other solutions:

  1. Create a new user account and use it.
  2. Book an Apple Genius Appointment to check and solve the issue.

If you know any other solutions to fix this issue, let us know through your comments.

11:51 am

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