Safe Mode For Mac Sierra

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Mac won't start/boot after macOS High Sierra update/installation, help!

Oct 08, 2013  Boot in safe mode to rebuild the font caches. Boot again as usual and test. Note: If FileVault is enabled on some models, or if a firmware password is set, or if the boot volume is a software RAID, you can’t boot in safe mode. In that case, ask for instructions. Safe mode and single-user mode are two of the special start-up modes that your Mac can be powered up to. They’re often used to troubleshoot issues a Mac may be experiencing or to assist in isolating and repairing some common issues that can keep a Mac from starting up correctly, or that make it act strangely when it’s in use. Safe Boot (a term often used interchangeably with Safe Mode) works by allowing your Mac to start up with the minimal number of system extensions, preferences, and fonts it needs to run. By minimizing the startup process to only the components that are required, Safe Boot can help you troubleshoot problems by isolating the issues.

'I upgraded my iMac into latest macOS High Sierra last night. And when I completed the update process, tried to start the computer. It won't boot.
I tried to hard reboot Mac computer, but nothing showed up. What else can I do to wake up the computer and make it work again with macOS High Sierra?

Mar 20, 2018  How to start your Mac in Safe Mode. To restart your Mac in Safe Mode, begin with your Mac switched off or restart it. 1) As soon as your Mac switches on and lights up, press and hold the Shift key. 2) Release the Shift key as soon as the login window appears. That’s it, your Mac has now been booted in safe mode.

Although Mac hard drive boot failure issue is not a new problem anymore. But it's still a tough case for ordinary users to fix when their Mac computers fail to boot after macOS High Sierra update or installation. If you are having such a problem, relax! This tutorial article will show you how to quickly fix and resolve Mac hard drive won't boot issue after macOS High Sierra update. Just follow any one of offered methods to get your Mac computer back to work again now:

Quick Fix 1. Reset SMC to fix Mac won't boot after High Sierra update

Sometimes, if the Mac computer cables are not connected properly, you may not be able to boot it normally. So if Mac cannot boot after system update, you can reset SMC to fix Mac won't boot issue after macOS High Sierra update:

1. Shut down Mac computer and unplug all cables;
2. Wait for a few minutes and then plug the cables back;
3. Restart Mac computer to see if you can enter the system or not.

Quick Fix 2. Force to reboot Mac and reset NVRAM to fix Mac won't boot issue

1. Press and hold Power button for a few minutes till Mac turns off;
2. Wait a few seconds and press Power button to turn on Mac;
3. Hold Command + Option + P + R keys while booting Mac to reset NVRAM;
4. Reboot computer again to see if the problem gets solved or not.

Note: If these two quick fixes didn't help, continue with below complete solutions to get your problem resolved now.

Complete solution to fix Mac won't boot/fails to boot error after macOS High Sierra update

Step 1. Recover data when Mac hard drive won't boot from High Sierra

If you have important data saved in Mac computer hard drive, do remember to restore data before taking actions to fix Mac won't boot error.

Professional Mac data recovery software with bootable disk can help you effectively restore your data out of Mac hard drive when the computer fails to boot. You can directly purchase EaseUS Data Recovery Wizard for Mac with Bootable Media to create a bootable media for Mac and apply it to restore data from fail to boot Mac computer now:

1. Insert the created bootable media into Mac and turn on Mac computer, immediately press and hold the Option key and select EaseUS Data Recovery Wizard for Mac to boot;
2. Connect an external storage device to Mac computer;
When EaseUS Data Recovery Wizard for Mac launches, follow this tutorial to restore lost files on Mac.

Step 2. Fix Mac won't boot error after macOS High Sierra update
Fix macOS High Sierra won't boot issue

Method 1. Boot Mac from Safe Mode to fix Mac won't boot issue

1. Turn on Mac, press Shift when you hear the startup sound and release it till you see Apple logo;
2. After Mac fully starts, restart the computer normally without holding any keys/buttons.
3. Wait patiently till Mac computer finish the reboot process.

Method 2. Use Disk Utility to restore Mac from Recovery Mode when macOS High Sierra won't boot

1. Boot Mac up, press Command + R during the boot-up process;
2. Click Disk Utility option > Click First Aid and try repairing Mac's disk;
3. Disk Utility will automatically run a fsck (file system check) operation to help you repair macOS High Sierra fail to boot error;
4. If this fails, try restore from Recovery mode.
5. Reinstall OS X in Recovery Mode will automatically download and install the latest macOS High Sierra for your Mac device.

Method 3. Run Terminal to repair Mac hard drive won't boot error due to High Sierra update

1. Open Terminal > Applications > Utilities;
Enter: system_profile SPExtensionsDataType > ~/Desktop/kextList.txt and hit return;
2. Open the kextList.txt file on desktop > Press Apple(Command) + F to bring up find;
3. In the find field insert 'Obtained from: Not Signed' and copy the destination to the .kext file to a list for use later;
4. Click Next to cycle through all of them, for example: /System/Library/Extensions/JMicronATA.kext
5. Browse your drive to /System/Library/Extensions and remove all unsignedkext files;
6. Reboot and your Mac boot problem shall be all set.

Method 4. Reinstall macOS High Sierra to resolve Mac won't boot issue

The last method that you can try is to download macOS High Sierra and create a new bootable drive to clean install macOS High Sierra on Mac computer so to make it boot up normally and work smoothly again.

1. Connect USB bootable drive on Mac and restart Mac by holding Option till you hear the reboot tone;
2. Select disk called Install macOS High Sierra in the drive list that appears on screen;
3. Once USB drive is booted, select Disk Utility > Choose Mac's startup from the list > Click Erase;
4. Once Mac's startup disk is formatted, return toUtilitieswindow and select Install macOS > Choose just erase startup drive to install macOS > Follow onscreen prompts to complete the installation.

This may take you a few hours to complete the task. And of course, if you have important data, follow Step 1 to get all saved data out firstly.


Mac users have a lot of doubts about the precious Safe Mode-like how to open it, why or when to use, and many more. In this post, I’ll tackle all these questions with this Guide about how to StartMac in Safe Mode. After going through this, you’ll realize that Safe Mode is capable of so many things.

Also, you’ll know that when and where you should seek help from the Safe Mode in order to keep your Mac healthy. Let’s begin.


  • 1 Safe Mode in Mac [Guide]
  • 2 How to Start Mac in Safe Mode?

Safe Mode in Mac [Guide]

This guide comprises all the information about the invaluable Safe Mode available on Mac. All the questions related to it are answered, along with the additional information. After going through this, you’ll be way ahead than millions of Mac users who still don’t know everything about using their Mac in Safe Mode.

What is the Safe Mode on Mac?

Safe mode, sometimes also known as Safe Boot, is a toned down way to start up your Mac so that it performs certain checks and prevents some software from automatically loading or opening. If you start your Mac in Safe Mode, the following things will be done:

  • It will verify your startup disk and attempt to repair directory issues if needed.
  • Mac will load only required kernel extensions.
  • It will Prevent startup items and login items from opening automatically.
  • The user-installed fonts are disabled.
  • The font caches, kernel cache, and other system cache files are deleted.

If your Mac has developed an issue that goes away when you start up in safe mode, you might be able to isolate the cause with its help.

Why Start Mac in Safe Mode?

The main benefit of using Mac in Safe Mode is that it can help you resolve issues that are stopping your Mac from starting up or any issues related to your startup disk. A lot of users believe that whenever there is an issue or error in your Mac, using the Safe Mode should be your first steps. This is most of the times effective also, as the caches are cleared in the safe mode, and these can become corrupted leading to the particular problems.

Some users also use the safe mode to uninstall apps that otherwise prove to be sticky. This means that they are impossible to delete in normal operating mode because they are attached to a system service that won’t terminate. In the safe mode, all non-essential services aren’t loaded, this overcomes the hurdle, and you’ll be able to get rid of the unwanted apps. While some users use the Safe Mode to speed things up as starting in Safe Mode will clear the cache.

Where to use Safe Mode?

Here are some of the common scenarios when you might need to use your Mac in Safe Mode:

  • When your Mac gets stuck or freezes during startup.
  • When an app is causing problems in your system leading to some issues.
  • If you want to delete a certain app that won’t be uninstalled in normal mode.
  • When your Mac is running very slowly or hanging.

Note:Remember that cleaning the caches using either method may make for a slower Mac in the first few reboots after it is cleared. As the sole purpose of caches is to make your system work faster.

  • To check if you may have incompatible login items.
  • In order to check the cause of certain issues. If after using Safe Mode, you reboot and the issue is gone, it is likely that the problem was related to a cache or directory issue that has been fixed by the Safe Mode.

Mac Stuck In Safe Mode

How to Start Mac in Safe Mode?

Till now, you have learned what is Safe Mode, and why & where you shall use it. Now you’ll learn how to open or start Mac in Safe Mode. Follow these steps in order to start your Mac in Safe Mode:

Step-1: Start or Restart your Mac.

Step-2: Now immediately press and hold the Shift key. The Apple logo will appear.

Step-3:Release the shift key and log in when the login window appears.

Note: You may need to log in twice if you have FileVault turned on. First time to unlock the startup disk, and the second to log in to the Finder.

You can return to the Normal Mode by simply restarting your Mac without pressing any keys during the startup.

An Alternative Way to Open Mac in Safe Mode

If you don’t have a keyboard or your Shift key is not working, or if you just don’t want to use the Safe Mode from the startup, there is an alternative method present for you. Follow these steps in order to use Mac in Safe Mode from Terminal:

Step-1: Open Terminal by going to: Applications > Utilities > Terminal.

Step-2: In the Terminal Command line, copy & paste the following code and hit Enter:

sudo nvram boot –arg=”-x”

Step-3: Now enter your password to authorize your action.

You can return to Normal Mode by opening Terminal, pasting sudo nvram boot-args=”” and hitting Enter.

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How to know if your Mac is in Safe Mode?

If you are unsure that whether your Mac has started in safe mode or not, you can use System Information to confirm. The Software section of System Information lists Boot Mode as Safe instead of Normal when you are using Mac in safe mode.

Also, the login window displays Safe Boot in the upper-right corner of the screen when your Mac is running in safe mode.

What are the features NOT available in Safe Mode?

Only essential components run under the Safe Mode, so there are some features that are not available when you boot your Mac in Safe Mode. Here are the most common ones:

  • Movies can’t be played in DVD Player.
  • Videos can’t be captured in iMovie and some other video apps.
  • Certain audio input or output devices may not work.
  • The USB, FireWire, and Thunderbolt devices might not be available.
  • Wi-Fi networking will be limited or unavailable. This depends on the Mac and macOS version you’re using.
  • Some Accessibility features might not work as expected, for example, VoiceOver.
  • File sharing will be disabled.

What if Mac has problems even in Safe Mode?

Safe Mode For Mac Sierra Vista

If your Mac keeps restarting or shutting down continuously even in the Safe Mode, then you should consider contacting Apple’s Customer Support as soon as possible. They’ll be more than glad to help you out.

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Done. That’s all. For any queries, doubts or suggestions, feel free to visit the comments section. Hope I helped you.

Safe Mode For Mac

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