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Jun 30, 2020  Lest Mac Update Stuck, Back Up Your Mac Data Now! To prevent the unexpected Mac update problems, you're suggested to back up your Mac files with MacX MediaTrans. Recovery mode software for mac. Backup crucial data like photo, video, music, ebook, iTunes purchases etc.; Blazing fast to make a backup, up to 8 seconds for 100 4K photos backup; Do what iTunes does and doesn't do, never erasing any existing data on your Mac. Mar 31, 2020  Apple also releases system updates that keep your Mac secure and stable. When a new major version of OS X is released, you can download the upgrade for free from the App Store. If you're using an older version of OS X, updates are handled through the Software Update utility.

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• Open System Preferences (you can click on the Apple logo in the menu to find it). Click on Software Update. Your computer will check for updates, and show that an update is available for your Mac.
• Dec 21, 2019  Usually files in the Mac OS Documents folder work as expected, but Apple really wants you to put them into this obscure location, which is hidden by default in Mac OS. Microsoft Office is happy if you put them there or into OneDrive or SharePoint. There is a piece of advice I can give you that might correct the problem.
• Easily check which versions of mac OS, iOS, iPadOS, or watchOS are compatible with your Mac model or iDevice. Guide includes OS X 10.8.x to macOS 11.0.x.

Summary

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 Catalina, Sierra or older macOS update issue. If you are with this issue, follow to make your Mac computer work now:

macOS has now been updated to 10.15, 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 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! App to play rf on mac pc. In some cases, after performing this step, your Mac will restart normally.

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• 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.

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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 Catalina/Sierra

The last method to fix macOS Catalina or Sierra fails to boot after update error is to reinstall macOS.

• You can download wanted macOS Catalina/Sierra and create a bootable USB drive to clean install macOS 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.

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If you try to start up your Mac from a hard disk, network volume, or Time Machine backup that contains an incompatible version or build of macOS, you might experience one or more of these symptoms:

• Your Mac doesn't finish starting up, or displays a prohibitory symbol at startup.
• You see a message that you're using an unsupported or incorrect version of the Mac operating system.
• Your Mac doesn't respond to your trackpad, mouse, or keyboard.
• Apps unexpectedly quit.
• Your Mac doesn't sleep or wake.
• You don't hear any sound from your Mac.
• The fans in your Mac are louder, because they're spinning faster.
• The image on your display appears to shrink, has black bars around it, or appears tinted.
• You can't use Bluetooth or Wi-Fi.

Which Mac operating systems are compatible?

The version of macOS that came with your Mac is the earliest version compatible with that Mac. To find out whether your Mac is compatible with a later version of macOS, check the system requirements:

If your Mac won't start up from a compatible version of macOS, it might require a specific build of that version. To get the correct build, reinstall macOS or upgrade to a later version of macOS.

Learn more

• To restore a Time Machine backup that was created on a different Mac, use Migration Assistant.