Mac fails to boot or start after the macOS update. Whatever is preventing your Mac from starting up, follow these 5 simple solutions to get it working again. If you have data loss problem after macOS update, EaseUS Data Recovery Wizard for Mac provides tried-and-true data recovery service to you.
This page covers 5 fixes for Mac won't boot or start issue after macOS Big Sur, Catalina, Sierra or older macOS update issue. If you are with this issue, follow to make your Mac computer work now:
It is possible to downgrade it to run the said release of macOS High Sierra on your MacBook Pro. Updating to macOS High Sierra Download doesn't finish. 2018 MacBook Pro won't let me install macOS High Sierra 10.13 from USB installer.
- This update won't include the latest version of the software so after performing the update, check Software Update and apply the latest macOS update. Install the OS from an external drive.
- Download the macOS 10.12 Installer. Download the new macOS 10.12 Sierra from the Mac App.
- It only means that the installer won't run on that system version. You will see that message after the download is complete (because the system automatically tries to launch the installer).
Workable Solutions | Step-by-step Troubleshooting |
---|---|
Fix 1. Fix PRAM/NVRAM | Restart Mac > Hold Command+Option+P+R keys to turn on Mac...Full steps |
Fix 2. Reset SMC | Shut down Mac > Unplug all cables > Plug in cables back after a few minutes...Full steps |
Fix 3. Boot in Safe Mode | Start Mac > Hold 'Shift' until the login window appears > Release the key when login in window appears...Full steps |
Fix 4. Run Disk Utility | Turn of Mac > Hold Command + R keys and power Mac back up > Enter recovery mode...Full steps |
Fix 5. Reinstall macOS | Download macOS Catalina, Mojave, or Sierra > Create bootable USB > Clean install macOS...Full steps |
macOS has now been updated to 11.0, and many Mac users are trying to upgrade to the newest version. While for most it's a usual pleasurable experience, for some this update had downsides. Some users complain that their Mac computers won't boot after installing new macOS Big Sur/Catalina. When Mac fails, it usually can't boot or start up properly. If you are faced with this situation, the most important thing should be recovering data from the unbootable Mac because:
- Your attempts to fix the Mac not booting issue may write new data on this Mac, which will overwrite the old data and make it irrecoverable.
- Recovering data before the complex fixes can avoid data loss.
EaseUS Mac data recovery software is able to recover data from unbootable Macs after update. It creates a bootable media that enables you to recover data from Mac hard drive (If you only have one Mac). What's more, it recovers data from failed internal Mac hard drive, APFS boot drive, and unmountable APFS boot volume, etc. If you have two Mac devices, take out the hard drive and connect it to the other Mac. Download EaseUS Data Recovery Wizard for Mac on that Mac device, and recover data from the hard drive.
Then, you can read on and Fix the 'Mac won't boot after update' issue after you have successfully got data from the drive.
1. Reset the PRAM / NVRAM
NVRAM refers to special memory sections on your Mac that store data that persists even when the Mac is shut off, such as volume settings and screen resolution. Resetting that data isn't harmful! In some cases, after performing this step, your Mac will restart normally.
- Restart your Mac
- Hold down all of these keys: 'Command', 'Option', 'P' and 'R', and turn on the Mac. (It's the same keys to reset the PRAM).
- Keep holding the keys down until you hear the Mac restart again.
You may see a progress bar on startup. If the progress bar fills up and then the Mac starts up, you're probably good to go. If not, reset SMC.
2. Reset the SMC
In some situations, you may need to reset your Mac's SMC (System Management Controller).
- Shut the Mac down.
- Unplug all cables.
- Wait for a few minutes.
- Plug the cables back in and start up the Mac.
If you've got a Mac desktop, unplug it for 15 seconds and then plug it in and after five seconds press the power button.
3. Boot Mac in Safe Mode
Safe Mode is a stripped-down version of the Mac operating system that can be useful if you are trying to troubleshoot issues with your Mac.
- Start your Mac, press and hold the 'Shift' key, and make sure your Mac has at least 9 GB of free space.
- When the login window appears to release the shift key and log in. You may be required to log in twice if you have FileVault turned on. Then restart the device.
Wait patiently till Mac computer finish the reboot process.
4. Run Disk Utility in Recovery Mode
If your Mac is booting but the operating system isn't loading up, you may have a corrupted drive. Luckily it is possible to fix this in Recovery Mode. In Recovery Mode you can restore from a Time Machine backup, use Disk Utility to verify and repair connected drives, check your internet connection, get help online using Safari, and install or reinstall macOS.
- Make sure the Mac is off. If it's stuck on a grey, blue or white screen, just hold down Mac's power button for several seconds until it shuts off.
- Hold down the 'Command' and 'R' keys, and power the Mac back up again. Keep pressing 'Cmd' + 'R' while your Mac is booting up.
- Once your Mac starts in Recovery Mode you can have access to 'Utilities'. Click 'Disk Utility', locate the icon for your Mac's drive, and click 'Verify Disk'.
5. Reinstall macOS Big Sur/Catalina/Sierra
The last method to fix macOS Big Sur, Catalina or Sierra fails to boot after update error is to reinstall macOS.
- You can download wanted macOS Big Sur/Catalina/Sierra and create a bootable USB drive to clean install macOS Big Sur/Catalina/Sierra on your computer again.
- You can also boot into Recovery mode (Solution 4), and then click to install the latest OS and follow the onscreen prompts. Our article on resetting a Mac to factory settings has more information on reinstalling macOS.
If your Mac does not respond after trying these tips, contact Apple Support or a certified Apple Repair Center. It's likely there is a problem with your logic board or other internal hardware.
High Sierra is an update of MacOS which focuses mostly on back-end developments and a higher level of user security. As such, this operating system lays a foundation for future upgrades.
Stay safe
In essence, High Sierra took what was good with Sierra and developed it into a more comprehensive software.
High Sierra emphasizes the already-existing benefits of MacOS previous system, Sierra. There are few bells and whistles, but the changes are noticeable and positive. The Apple file system is the most significant feature it brought. It enables the storage and encryption of a large number of files. Thus, it boosts performance and helps manage device memory issues.
Apple also introduced new formats for video and photos in this version. These formats compress data - that's a benefit as files can get huge with ever-rising resolutions. They added support for virtual reality headsets as well.
Besides that, when it comes to Safari, Mac search engine, there are some notable improvements with the update. The users can now control annoying auto-play videos, prevent tracking, and more. There are also notification controls, and you will experience a boost in performance, too.
Macos Sierra Macbook Pro Won't Download Windows 7
The most noticeable changes took place in Apple's Photo App, though. It went through a total revamp both visually in its interface and terms of tools and functions available. Many other discreet changes happened all over the system.
Where can you run this program?
If you're running Sierra on your Mac, you will be able to run this one as well.
Is there a better alternative?
Yes. Mojave, the newest version of MacOS, brought even more improved features to the table. However, if you can't run it on your device, this is the second best.
Our take
Macos Sierra Macbook Pro Won't Download Windows 10
High Sierra is not the shiniest upgrade Apple brought, but it's one that sets the stage for new upgrades to come. Even out of that context, it's a great operating system.
Should you download it?
- Restart your Mac
- Hold down all of these keys: 'Command', 'Option', 'P' and 'R', and turn on the Mac. (It's the same keys to reset the PRAM).
- Keep holding the keys down until you hear the Mac restart again.
You may see a progress bar on startup. If the progress bar fills up and then the Mac starts up, you're probably good to go. If not, reset SMC.
2. Reset the SMC
In some situations, you may need to reset your Mac's SMC (System Management Controller).
- Shut the Mac down.
- Unplug all cables.
- Wait for a few minutes.
- Plug the cables back in and start up the Mac.
If you've got a Mac desktop, unplug it for 15 seconds and then plug it in and after five seconds press the power button.
3. Boot Mac in Safe Mode
Safe Mode is a stripped-down version of the Mac operating system that can be useful if you are trying to troubleshoot issues with your Mac.
- Start your Mac, press and hold the 'Shift' key, and make sure your Mac has at least 9 GB of free space.
- When the login window appears to release the shift key and log in. You may be required to log in twice if you have FileVault turned on. Then restart the device.
Wait patiently till Mac computer finish the reboot process.
4. Run Disk Utility in Recovery Mode
If your Mac is booting but the operating system isn't loading up, you may have a corrupted drive. Luckily it is possible to fix this in Recovery Mode. In Recovery Mode you can restore from a Time Machine backup, use Disk Utility to verify and repair connected drives, check your internet connection, get help online using Safari, and install or reinstall macOS.
- Make sure the Mac is off. If it's stuck on a grey, blue or white screen, just hold down Mac's power button for several seconds until it shuts off.
- Hold down the 'Command' and 'R' keys, and power the Mac back up again. Keep pressing 'Cmd' + 'R' while your Mac is booting up.
- Once your Mac starts in Recovery Mode you can have access to 'Utilities'. Click 'Disk Utility', locate the icon for your Mac's drive, and click 'Verify Disk'.
5. Reinstall macOS Big Sur/Catalina/Sierra
The last method to fix macOS Big Sur, Catalina or Sierra fails to boot after update error is to reinstall macOS.
- You can download wanted macOS Big Sur/Catalina/Sierra and create a bootable USB drive to clean install macOS Big Sur/Catalina/Sierra on your computer again.
- You can also boot into Recovery mode (Solution 4), and then click to install the latest OS and follow the onscreen prompts. Our article on resetting a Mac to factory settings has more information on reinstalling macOS.
If your Mac does not respond after trying these tips, contact Apple Support or a certified Apple Repair Center. It's likely there is a problem with your logic board or other internal hardware.
High Sierra is an update of MacOS which focuses mostly on back-end developments and a higher level of user security. As such, this operating system lays a foundation for future upgrades.
Stay safe
In essence, High Sierra took what was good with Sierra and developed it into a more comprehensive software.
High Sierra emphasizes the already-existing benefits of MacOS previous system, Sierra. There are few bells and whistles, but the changes are noticeable and positive. The Apple file system is the most significant feature it brought. It enables the storage and encryption of a large number of files. Thus, it boosts performance and helps manage device memory issues.
Apple also introduced new formats for video and photos in this version. These formats compress data - that's a benefit as files can get huge with ever-rising resolutions. They added support for virtual reality headsets as well.
Besides that, when it comes to Safari, Mac search engine, there are some notable improvements with the update. The users can now control annoying auto-play videos, prevent tracking, and more. There are also notification controls, and you will experience a boost in performance, too.
Macos Sierra Macbook Pro Won't Download Windows 7
The most noticeable changes took place in Apple's Photo App, though. It went through a total revamp both visually in its interface and terms of tools and functions available. Many other discreet changes happened all over the system.
Where can you run this program?
If you're running Sierra on your Mac, you will be able to run this one as well.
Is there a better alternative?
Yes. Mojave, the newest version of MacOS, brought even more improved features to the table. However, if you can't run it on your device, this is the second best.
Our take
Macos Sierra Macbook Pro Won't Download Windows 10
High Sierra is not the shiniest upgrade Apple brought, but it's one that sets the stage for new upgrades to come. Even out of that context, it's a great operating system.
Should you download it?
Yes, if your device can support it. The new options and better security settings are worth getting.
Macbook Pro Macos Mojave
10.13