Latest Ways to Fix macOS Sierra Won’t Boot after Updating Safely

Lisa

March 18, 2019 09:00 / Posted by Lisa Ou

There are many complaints about Mac won’t boot after Sierra update issues.

  • - “After updating to macOS Sierra, my MacBook Pro (2011) turns off while the bar is loading…”
  • - “I updated to Sierra 10.12.3 doing the normal process through the App Store. But it doesn’t boot into the OS anymore…”

If you encounter the same macOS Sierra won’t boot after updating problem, you just come to the right place. Here are 4 workable solutions you can take.

Fix macOS Sierra Won’t Boot after Updating Safely

1. Reset PRAM/NVRAM When Mac Won’t Boot after Updating

NVRAM is short for non-volatile random-access memory. As for P, it used to be a Parameter. Generally speaking, PRAM or NVRAM can save data that persists while the Mac is shut off. Resetting PRAM/NVRAM will not erase your Mac data. So you can fix macOS Sierra won’t boot after updating via this method.

Power off and on your Mac computer.

Hold and press Command, Option, P and R keys simultaneously during Mac startup.

Release those keys when you hear the startup sound.

Reset PRAM/NVRAM

You can also learn how to fix MacBook Pro shuts down randomly or fix macOS Sierra 10.12.1 Update Stuck Error.

2. Reset SMC If macOS Sierra Won’t Boot after Updating

If your Mac still won’t boot after Sierra update, you can reset SMC (System Management Controller) to fix the failing Mac startup. It is an effective method to troubleshoot hardware misbehaving or slow performance.

Shut down your computer. Force quit all apps. Unplug all cables.

Hold and press Shift, Control, Option and Power keys at the same time to reset SMC on Mac laptop.

Re-plug all cables to Mac after 5 seconds. Wait another 5 seconds and turn on your computer to reset SMC on Mac desktop.

unplug mac cables

3. Boot Mac into Safe Mode to Fix Mac Won’t Boot after Installing macOS Sierra Update

Safe Mode is the default diagnostic tool that can disable troublesome programs and change persistent settings effectively. You can get rid of glitches by booting Mac into Safe Mode.

Consequently, you can enter into Safe Mode to fix Mac won’t boot after macOS Sierra update or macOS Sierra 10.12.1 Update Stuck Error. To start with, you need to free up at least 9GB free storage space. 

Power off your Mac computer.

Hold and press Power and Shift keys together.

Do not release the Shift key until you see the Mac login screen.

Log into your Mac user account.

Wait patiently to see if Mac can reboot successfully.

mac could not be installed on computer

4. Restore Mac from Recovery Mode When macOS Sierra Won’t Boot after Updating

If your Mac stuck on restart after update, you can run Disk Utility to verify and troubleshoot the corrupted hard drive. Later, you can reinstall macOS Sierra update to fix Mac won’t boot after Sierra update.

Press the Power key to force quit Mac from grey, blue or white screen.

Hold and press Command, R and Power keys to boot Mac in Recovery Mode.

Choose Finder, Applications, Utilities and Disk Utility. Find your Mac drive’s icon and choose Verify Disk to identify the real cause.

Click First Aid on the top toolbar and follow its wizard. Disk Utility will run fsck to fix macOS Sierra won’t boot after updating error automatically.

If Mac fails to boot, you can reinstall the latest macOS Sierra update via Recover Mode.

boot mac into recovery mode

5. What to Do If You Cannot Find Important Files after macOS Sierra Updating

What if you forget to make a backup of important files after reinstalling macOS Sierra? You can run FoneLab Data Retriever to recover any lost data from the unbootable Mac. The Mac data recovery software allows users to recover photos, videos, music, documents, emails and many other files from your Mac without backup selectively.

Even though your Mac won’t boot or have other crashed problems, you can still recover files in original state in a short time. Be aware that you need to recover Mac data as soon as possible.

Otherwise, your deleted or lost files may be overwritten by new files.

  1. Recover deleted or lost data due to macOS Sierra won’t boot after updating, RAW hard drive, formatted partition and more.
  2. Filter and preview any deleted or existing file with the detailed information.
  3. Find your files from the certain partition with Quick Scan or Deep Scan mode.
  4. Work with Mac 10.7 and above (macOS Mojave supported).
  5. It allows you to recover data from memory card, SD cad, and more.
launch mac file recovery

As a result, you can fix macOS Sierra won’t boot after updating without data loss here. By the way, you can use Data Retriever to get back any file existed on Mac before. If you cannot find the certain file, you can also use the Mac data recovery software to solve the problem perfectly.

You can download and try to recover hidden files on Mac or recover data from hard drive now!

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