Mac won't start/boot after macOS High Sierra update/installation, help!
A desktop app that shows you how much time left in percentage. Although Big Sur has been available to everyone for the last few months, there are still some valid reasons as to why you may not want to update. For one, the update to macOS Big Sur is one of the biggest updates that Apple has released for the Mac. There are a slew of new UI changes, along with how your Mac looks and feels. Your Mac will need macOS 10.12.4 or later to work with Night Shift. MacOS 10.12.4 is currently in developer beta and a public beta is likely around the corner; the software update will be available.
OS X Mountain Lion (version 10.8) is the ninth major release of macOS, Apple Inc.' S desktop and server operating system for Macintosh computers. OS X Mountain Lion was released on July 25, 2012 for purchase and download through Apple's Mac App Store, as part of a switch to releasing OS X versions online and every year, rather than every two years or so. Across the last two decades, Apple has released major new versions of its modern OS for the Mac at regular intervals. Since 2016, it has deemphasized the Roman numeral 'X,' shifting its marketing.
'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?'
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.
Mac Os Versions List
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.
After remaining in the 10th iteration of Mac OS from 2001 to 2020, Apple moved to macOS 11 with Big Sur. Over its lifetime, Apple has made considerable improvements to the performance, security, and functionality of the software, making it one of the most robust and user-friendly operating systems around.
● Operating System for Mac and MacBook
● Started as Mac OS in 1984
● Mac OS X shipped March 2001
● Unix-based OS
● Major releases originally named after big cats
● Now named after California locations
Apple's macOS is the operating system that runs on the company's Mac lineup. The software, which is free to update for all Mac and MacBook owners, handles system functions, applications, and hardware controls.
Apple designed macOS to run as optimally as possible on the company's hardware. It also connects to Apple's online services, including the Mac App Store, Apple Music, iCloud, and related services. It includes considerable security protections to keep users and their data safe from harm.
Based on Unix at its core, macOS is a flexible operating system. Power users will appreciate its configurable aspects, such as Terminal commands or server-based applications. However, it's also friendly towards more casual users, gaining many iOS features and visual design cues through the years.
macOS started as Mac OS, which launched in 1984. It underwent multiple major releases until the final version under the initial name, Mac OS 9, shipped to customers in 1999.
Apple changed its naming policy with the launch of Mac OS X, known colloquially as OS X, in March 2001. After that release, Apple kept the major version number at 10 for nearly two decades. Instead of changing the major version number, Apple used a following minor number to indicate annual upgrade releases, such as version 10.1, 10.2, and 10.3.
In 2016, Apple altered how it referred to the operating system. Still known as Mac OS or OS X prior to that, the company switched to macOS. This matched the naming pattern of its other operating systems, including iOS, tvOS, and watchOS.
Apple's 10.X naming scheme changed with macOS Big Sur's arrival in 2020. Apple finally retired the old naming scheme and called Big Sur version 11.
As well as the official name and version number, Apple has also altered the release title for each over time. From the release of Mac OS X 10.0 Cheetah until OS X 10.8 Mountain Lion, Apple referred to the operating system by the name of a big cat. Starting with OS X 10.9 Mavericks, Apple switched the naming convention to refer to California landmarks. The company has continued to do so since then.
macOS 11 Big Sur
Apple announced macOS Big Sur at WWDC 2020 and released the new OS in November 2020. The operating system was redesigned with new textured icons, colorful sidebars, and more transparent and curvy elements. The design changes make the Mac look much like iPadOS than ever before.
Big Sur also begins to move the Mac away from Intel chips to custom Apple Silicon, including the new M1 chip.
Apple offers several tools to help developers make the transition. All iOS and iPadOS apps can run on Apple Silicon natively, though developers can opt out of offering them in the Mac App Store. Developers can also easily upgrade their mobile apps to be more Mac-like with Mac Catalyst.
The first Apple Silicon-running Macs, including updated models of the 13-inch MacBook Pro, MacBook Air, and Mac mini, use Rosetta 2 for non-optimized apps. This virtualization software runs Intel apps on M1 Macs, at speeds similar to how they'd run on Intel Macs. Rosetta 2 helps both users and developers transition away from Intel.
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Apple updated Safari in the new version with more privacy and security protections. Apple has made third-party extensions work with Safari even if they were built for Chrome. The ability to translate webpages is now a built-in function and works entirely on-device.
Messages is now a Mac Catalyst app that has feature parity with its iOS counterpart. Users can send message effects and Tapbacks, and tag users in a group chat just like in iOS 14 for iPhone.
Released on October 7, 2019, macOS 10.15 Catalina introduced significant improvements to app handling.
A major change in Catalina was Apple's decision to end support for 32-bit apps, requiring developers to rework their apps into 64-bit versions to continue functioning properly. Not all developers elected to migrate their apps, forcing some users to choose between abandoning vintage apps or upgrading to Catalina.
Another chief change is the removal of iTunes, in favor of new apps that replace the majority of its functions. New apps for Apple Music, Apple Podcasts, and Apple TV spread iTunes' core functions across apps that correspond to iOS counterparts. Another iTunes feature, iOS device backup duties, is now found in the Finder.
Apple designed macOS to run as optimally as possible on the company's hardware. It also connects to Apple's online services, including the Mac App Store, Apple Music, iCloud, and related services. It includes considerable security protections to keep users and their data safe from harm.
Based on Unix at its core, macOS is a flexible operating system. Power users will appreciate its configurable aspects, such as Terminal commands or server-based applications. However, it's also friendly towards more casual users, gaining many iOS features and visual design cues through the years.
macOS started as Mac OS, which launched in 1984. It underwent multiple major releases until the final version under the initial name, Mac OS 9, shipped to customers in 1999.
Apple changed its naming policy with the launch of Mac OS X, known colloquially as OS X, in March 2001. After that release, Apple kept the major version number at 10 for nearly two decades. Instead of changing the major version number, Apple used a following minor number to indicate annual upgrade releases, such as version 10.1, 10.2, and 10.3.
In 2016, Apple altered how it referred to the operating system. Still known as Mac OS or OS X prior to that, the company switched to macOS. This matched the naming pattern of its other operating systems, including iOS, tvOS, and watchOS.
Apple's 10.X naming scheme changed with macOS Big Sur's arrival in 2020. Apple finally retired the old naming scheme and called Big Sur version 11.
As well as the official name and version number, Apple has also altered the release title for each over time. From the release of Mac OS X 10.0 Cheetah until OS X 10.8 Mountain Lion, Apple referred to the operating system by the name of a big cat. Starting with OS X 10.9 Mavericks, Apple switched the naming convention to refer to California landmarks. The company has continued to do so since then.
macOS 11 Big Sur
Apple announced macOS Big Sur at WWDC 2020 and released the new OS in November 2020. The operating system was redesigned with new textured icons, colorful sidebars, and more transparent and curvy elements. The design changes make the Mac look much like iPadOS than ever before.
Big Sur also begins to move the Mac away from Intel chips to custom Apple Silicon, including the new M1 chip.
Apple offers several tools to help developers make the transition. All iOS and iPadOS apps can run on Apple Silicon natively, though developers can opt out of offering them in the Mac App Store. Developers can also easily upgrade their mobile apps to be more Mac-like with Mac Catalyst.
The first Apple Silicon-running Macs, including updated models of the 13-inch MacBook Pro, MacBook Air, and Mac mini, use Rosetta 2 for non-optimized apps. This virtualization software runs Intel apps on M1 Macs, at speeds similar to how they'd run on Intel Macs. Rosetta 2 helps both users and developers transition away from Intel.
Last The Night Mac Os Download
Apple updated Safari in the new version with more privacy and security protections. Apple has made third-party extensions work with Safari even if they were built for Chrome. The ability to translate webpages is now a built-in function and works entirely on-device.
Messages is now a Mac Catalyst app that has feature parity with its iOS counterpart. Users can send message effects and Tapbacks, and tag users in a group chat just like in iOS 14 for iPhone.
Released on October 7, 2019, macOS 10.15 Catalina introduced significant improvements to app handling.
A major change in Catalina was Apple's decision to end support for 32-bit apps, requiring developers to rework their apps into 64-bit versions to continue functioning properly. Not all developers elected to migrate their apps, forcing some users to choose between abandoning vintage apps or upgrading to Catalina.
Another chief change is the removal of iTunes, in favor of new apps that replace the majority of its functions. New apps for Apple Music, Apple Podcasts, and Apple TV spread iTunes' core functions across apps that correspond to iOS counterparts. Another iTunes feature, iOS device backup duties, is now found in the Finder.
10.15.1 introduced new emoji, support for the AirPods Pro, AMD Navi RDNA graphics cards in eGPU enclosures, alteration to the Photos app, and an option to opt in to Siri reviews.
10.15.2 made refinements to the Apple News, Stocks, Photos, Mail, and other apps, as well as fixes for issues in the Photos and Mail apps.
10.15.3 improved multi-stream video editing performance for HEVC and H.264-encoded video on the 16-inch MacBook Pro, along with Pro Display XDR optimizations.
10.15.4 added improved support for HDR-compatible monitors and added reference modes for the Pro Display XDR.
Out on September 24, 2018, macOS 10.14 Mojave's main new feature was dark mode, an alternate user interface. Users can switch between dark and light modes, and the theme can also change on a schedule via Dynamic Desktop.
Apple ported several iOS apps to macOS, including a News app, Stocks, Voice Memos, and Home for managing HomeKit. The initiative was part of 'Project Marzipan,' to enable iOS-developed apps to function in macOS with few changes. This initial quartet of apps demonstrated the concept to users and developers.
On the desktop, Stacks are an organization method for files in the workspace. Stacks piles up similar files into grouped collections automatically. Continuity Camera allows for photographs taken on an iPhone to be transferred instantly into a macOS application.
Day and night mode change your app appearance
10.14.1 consisted of new emoji, security enhancements and bug fixes, along with Group FaceTime.
10.14.2 provided security and bug fixes, a description matched by macOS 10.14.3.
10.14.4 added integration with the just-launched Apple News+ subscription service, in the Apple News app. Support for second-generation AirPods, Safari Autofill for MacBooks with Touch ID hardware, air quality index readings in Maps, and real-time text for phone calls made through a nearby iPhone were among the other changes.
10.14.5 was largely a maintenance update, though included fixes relating to AirPlay 2 support. 10.14.6 continued the security and bug fix theme.
Released on September 9, 2017, macOS 10.13 High Sierra included a major change for storage, with macOS switching over to the Apple File System, APFS. Intended to take advantage of the use of Flash and SSD storage, Apple built AFPS with encryption and enhanced security in mind. The company designed it to work with all Apple platforms, including watchOS, iOS, tvOS, and macOS.
The addition of Metal 2 included driver optimizations that brought up to 10 times better draw call throughput for graphics work, more debugging tools, and a migrated Mac Window Server.
Other notable items include the migration of H.264 to H.265/HEVC to better work with 4K and HDR content. It added faster and more power-efficient Safari. Apple's browser also added increased privacy protection, including Intelligent Tracking Prevention.
High Sierra was the last version to support 32-bit apps 'without compromises,' with Apple continuing its push to get developers over to making 64-bit apps.
10.13.1 added 70 new emoji, a fix to a Bluetooth bug involving Apple Pay, reliability improvements to Microsoft Exchange message encryption, a Spotlight input fix, and the patching of assorted KRACK wi-fi vulnerabilities.
10.13.2 was largely a maintenance release, improving compatibility for some USB audio devices, VoiceOver navigation while viewing PDFs, and a fix for a Root account generation flaw.
10.13.3 included relatively small updates, including an issue where Messages conversations were temporarily stored out of order.
10.13.4 incorporated a warning to users if they are running 32-bit apps and the launch of official eGPU support.
10.13.5 added support for Messages in iCloud, allowing conversations to be synchronized between multiple Apple devices.
10.13.6 delivered support for AirPlay 2, along with a variety of stability and security improvements.
Available to end users on September 20, 2016, macOS 10.12 Sierra heralded the introduction of Siri on Mac, bringing Apple's digital assistant to the desktop. Sierra also added a cross-platform clipboard synchronization with iOS and iCloud file synchronization between iOS and macOS.
The update added Picture in Picture feature, familiar to iOS users. It also included rich Messages that moved closer to iOS messaging, changes to Photos, Apple Pay for the web, and auto-unlock via Apple Watch.
10.12.1 added iPhone 7 Photos compatibility fixes, Safari security enhancements, and fixes to Microsoft Office and Exchange issues, among other changes.
10.12.2 improved the setup and reliability of Auto Unlock, Touch Bar screenshot support, and a wide variety of fixes and improvements.
10.12.3 improved automatic graphics switching on the 2016 MacBook Pro 15-inch, a fix for PDF corruption, and MacBook Pro battery drain issues in Safari.
10.12.4 added Night Shift, new PDFKit APIs, cricket scores to Siri, and more options for iCloud Analytics.
10.12.5 solved stuttering audio issues for USB headphones, a 'media-free' installation of the Windows 10 Creators Update using Boot Camp, and enhancements to the Mac App Store for compatibility with 'future software updates.'
10.12.6 largely consisted of a maintenance update.
Apple's 2015 update focused less on marquee features and more on performance enhancements and subtle refinements. Apple released macOS 10.11 El Capitan on September 30, 2015.
Last The Night Mac Os Catalina
The update added macOS support for Apple's Metal API. Metal is a low-level API that helps developers optimize their apps' 3D graphics. Today, it's still used across iOS, iPadOS, macOS, and tvOS.
It also introduced Apple's San Francisco system font, which it still uses today across its platforms. Apple gave Mission Control, the window and desktop quick-view app, a makeover with a cleaner design.
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El Capitan brought new window-management options, including a green button that can move an app either into full-screen or Split View, a side-by-side multitasking feature also available on iPad.
The update enhanced Spotlight search, added Safari pinned sites and a mute button, and a modernized Notes app.
Apple gave its desktop software a new look with its 2014 update, OS X Yosemite. Version 10.10 redesigned various elements, including updated toolbars and translucent window elements.
Yosemite added the Today view in Notification center, which showed a customizable series of widgets. The Today view lived in a separate panel from notifications. Apple eventually killed the Today view in Big Sur, which integrated widgets into the same panel as grouped notifications.
The 2014 update also saw the launch of iCloud Drive, the file storage system built into Finder that serves as a rival to Dropbox and Google Drive. iCloud Drive didn't become ubiquitous across Apple's platforms until 2017, when the Files app launched on iOS and iPadOS.
Handoff launched during this software generation, on Yosemite and iOS 7. The feature allows you to pick up immediately where you left off when changing devices. Handoff adds user convenience and ecosystem stickiness, as the perk can encourage users to go all-in on Apple hardware.
Safari in Yosemite added the Favorites view and Tab view, and search-engine support for DuckDuckGo. Mail first supported Markup for filling out forms and annotating PDFs in Yosemite, and Messages gained a new look.
Apple released OS X Mavericks on October 22, 2013. The updated added iCloud Keychain, Apple Maps, and iBooks, which is now called Apple Books.
Mavericks also updated Safari, enhanced multi-display support, and added tabs and tags to Finder.
The update also included performance-enhancing and battery-boosting updates under the hood.
