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• Don't Look At Greg Mac Os Sierra
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Summary: This post is about how to fix when Mac won't boot after macOS update. If macOS Big Sur or macOS Catalina update makes your Mac not booting up, you'll know why and how to fix it quickly and easily.

Apple releases macOS and software updates periodically for better user experience. However, it backfires when your Mac is not booting up after macOS update. Especially for some Mac newbies, Mac not turning on would drive them crazy.

Hence, this post will walk you through this problem. Then, you'll know what to do when Mac gets stuck on the Apple logo.

All right. Let's begin with why your Mac is not booting up after the macOS update.

Why is the Mac not turning on after macOS update?

Why won't Mac update successfully? It's fair enough to say, most of the time, Mac won't turn on after macOS update because of software incompatibility and bugs.

As we all know, technology inspires new programs and hardware to be released constantly. So, your Mac needs to update to work with most software and hardware. Sometimes, it's an overall macOS update. And sometimes, it's a tiny patch like this.

In detail, a macOS update could involve those activities.

Don't Look At Greg Mac Os Sierra

1. Upgrade certain necessary drivers. Sometimes, it simply installs patches to fix bugs. But sometimes, it will replace the whole driver structure to better use hard drives, keyboard, mouse, microphone, camera, etc.
2. Upgrade the Kernel programs. Such updates will improve the security, accessibility, and management of core data.
3. Redesign or update certain built-in applications. Utilities like Disk Utility, Safari, and Mail come along with the operating system. So, it could be updated for a better user experience.
4. Other updates like operating system structure, file system, user interface, etc.

These updates are usually for a better user experience. Or they are for better supporting most of the latest hardware and software. However, as it is pointed out, the updated macOS can only work 'most' of them.

For example, Nvidia GTX 750 Ti can't work with Mac OS X earlier than Yosemite. After such a software update, Mac is not working, or the Mac or MacBook stuck on loading screen after macOS update. Once the third-party software and hardware on your Mac won't work with the latest macOS, your Mac won't turn on，or appears a pink screen on your Mac.

Common boot problems after macOS update

macOS is an improved range of Mac operating systems after Mac OS X. Up to now, there are three macOS systems available: macOS High Sierra, macOS Mojave, and macOS Catalina. Nevertheless, updating to each of them could cause problems.

1. Mac won't turn on after macOS Big Sur update

The newest major release of Mac operating system is macOS 11 Big Sur, which now is in beta version. Up to now, known boot issues of macOS Big Sur Beta include the following, or more.

• If you updated to macOS Big Sur 11.0 but not the newest vesion that has fixed existing bugs.
• You choose a wrong startup disk after installing macOS Big Sur 11.

A Complete List of macOS Big Sur Problems and Solutions

It talks about macOS 11 Big Sur update problems including downloading, installing, apps not working, not booting, battery issues and so on. Read more >>

2. Mac won't boot after macOS Catalina update

Then it comes to macOS Catalina. Even though it should be better than the previous two, (In some aspects, it is.) Catalina update problems like Mac won't boot after macOS update still occur.

Except for APFS conversion, the macOS Catalina update will automatically divide your hard drive into two volumes. One is the read-only Macintosh HD system volume, and the other is Macintosh HD - Data for saving your files. But if there is not enough free space for an update, your Mac will get stuck on a update loop.Whta's worse, you might see the Mac folder with question mark at startup because macOS Catalina update is not found.

What's more, the 'Full Disk Access' permission might be a lion in the way for some unauthorized applications. For instance, you have a program that requires certain Kernel extensions. But after updating to macOS Catalina, this program can't access the Kernel resource anymore. It doesn't have permission. As a result, your Mac will be frozen at the loading bar because this program keeps asking for resource permission.

A Complete List of macOS Catalina Problems and Solutions

It talks about macOS Catalina problems including downloading, installing, apps not working, not booting, battery issues and so on. Read more >>

3. Mac won't restart after macOS Mojave update

macOS 10.14 Mojave is coming after 10.13 High Sierra. Thus, the same boot problems on macOS High Sierra could also happen to macOS Mojave. As you might know, Apple introduced the System Integrity Protection (SIP) feature since OS X EI Capitan. It was originally introduced to keep system security. But once this feature was disabled previously before you update to macOS Mojave, it could cause boot problems.

For example, the Google software update on September 23, 2019, was shipped with a bug. This flaw damages the macOS file system on computers where System Integrity Protection is disabled. Many video professionals reported that their Mac crashed due to this.

So, just think about it, even Google can't avoid such software conflict, how about other third-party software? That's one of the reasons why many users who disabled SIP previously get Mac crashed after installing macOS Mojave.

4. Mac won't boot after macOS High Sierra update

One of the major updates in macOS High Sierra is the introduction of the Apple File System (APFS). As a part of the upgrade process, the macOS High Sierra installer will automatically convert the SSD to the APFS file system.

Even though Apple claims that the conversion process is supposed to be risk-free, many Mac users still meet problems. And disk corruption during the update is one of them. In this case, it's sure that the Mac won't restart after update. Mac will stop loading after update for such corruption.

Except for hard drive corruption, hardware or software incompatibility is another major reason. As your computer needs to work with so much hardware and software, the in-between conflict is inevitable. Those incompatibilities could slow your Mac down. They could make your Mac not responsive. Or, the Mac won't let you log in with right password. Also, the Mac could freeze on a black or Mac white screen of death.

• Recover/reset your forgotten Mac password to enter your macOS

What to do if Mac can't turn on after macOS update?

Having discussed why Mac won't boot after macOS update, you may find that it's tricky to hit the point. But don't worry, here are some inspirations so that you can troubleshoot this issue step by step:

• 1. Check if the Mac hard drive is corrupted
• 2. Check if any program is not compatible with your macOS
• 3. Check for a hardware incompatibility

Step 1: Check and repair the Mac hard drive in macOS Recovery mode

If your Mac refuses to boot after the update, you should check the Mac hard drive. Chances are that your MacBook ran out of power and the APFS reformatting process was interrupted. Or the hard drive is corrupted for bad sectors.

• How to Boot into & Use M1 Mac Recovery Mode

In this case, you can try to repair the hard drive with Disk Utility under Recovery Mode. Disk Utility helps Mac boot up in some ways sicne it's the built-in free disk repair tool on your Mac.

Learn how to run First Aid on the startup disk and repair the file system or disk errors.

If no disk error was found by Disk Utility, then the hard drive should not be responsible for this issue. To find out why you can't turn on your Mac after macOS update, you can try Safe Mode.

Step 2: Boot your Mac into Safe Mode

You may be wondering 'why should I do this in Safe Mode?' The reason is that Safe Mode will only launch some basic necessary programs at startup. It’s easier to isolate incompatibility software that makes your Mac unbootable.

Make sense, right? Then let's dive into details on how to do this.

• 1. Press and hold the power button until the Mac forcibly shuts down.
• 2. To start the Mac up in Safe Mode, restart this Mac with Shift key pressed and held.
• 3. Release the key when you see the progress bar.

If you boot into Safe Mode successfully, you'll see Safe Boot at the right top. At least, it indicates that the macOS update is not failed. Then, it should be third-party software incompatibility.

But to figure out exactly which program makes your Mac unbootable, you need to reboot into Verbose Mode. Verbose mode allows you to see what's happening when macOS is starting up.

You can hold Command + V at startup. Then you'll see a live report when your Mac is booting up. Once you find out the culprit, you can simply uninstall the software in Safe Mode

But if you fail to boot into Safe Mode, it means it's a macOS update failure. The system data is damaged or broken. You need to reinsall the macOS in macOS Recovery mode. You can simply boot into macOS Recovery Mode and choose Reinstall macOS. If you don't want to update macOS anymore, you can try your luck with using APFS snapshot to recover your system.

The point is that macOS reinstallation will risk your data on the Mac. Thus, you should first check your backups. Or you can recover data from unbootable Mac first.

Learn how to get your important files off the startup disk when your Mac won't boot.

Tips: You can prevent APFS conversion with start to install this time if you want to avoid unnecessary problems. But you are not advised to unless you are a Mac command geek.

Step 3: Ask Apple repair store for help

The toughest thing is that your hard drive is fine. And there is no software incompatibility noticed in Verbose Mode. In this case, you should check the hardware inside your Mac.

The reason is that macOS updates are always for better supporting the latest software and hardware. So, the hardware or drivers on your Mac may be too outdated to work with the newer OS.

In this case, you can ask help from the Apple repair store and reset the Mac. If it's the Mac machine itself is too old, you should replace it with a newer Mac model. Or you simply don't allow automatically update the macOS.

How to avoid macOS update failure?

Every time there is a new macOS update available, you'll receive a notification. It asks 'Do you want to restart to install these updates now or try tonight?'. However, it's not safe to update directly because your Mac could get stuck on update or even lose important files. In case the Mac won’t boot after macOS Big Sur or Catalina update, you surely can do some preparations in advance.

• Read several reviews from tech enthusiasts to learn problems when a new macOS beta is released.
• Make sure your Mac model and its hardware work with the updated macOS.
• Read macOS update instructions carefully when you are up to update your system.
• Back up your files, photos, documents, etc.
• Make sure there is enough free disk space for macOS update.
• Make sure your Mac is connected to power to avoid the black screen of death during macOS update.

So, you'd better do these preparations before you update to any operating system. But if your Mac can't boot up already, you should calm down and follow this guide to fix this issue. If you have any more any feasible solution to enrich this article, kindly drop us a hint at [email protected]

What is QSearch virus? Cyber threat analysts has determined that so called QSearch virus is hijackware (also known as browser hijacker). It performs changes on popular web-browsers installed on affected MAC system. Particularly, it modifies the user’s default homepage, new tab page and search engine for their Google Chrome, Safari and Firefox web browsers.

Being infected by QSearch hijacker you will be forced to use its own search provider. It could seem not to be dangerous, but you still should be very careful, since it may show intrusive and harmful ads designed to trick you into buying some questionable software or products, provide search results that may reroute your web browser to certain deceptive, misleading or harmful sites. We recommend that you use only the reliable search provider like Google, Yahoo or Bing.

While the QSearch virus is active, you won’t be able to return the Safari, Firefox and Chrome’ settings like default search engine, start page and newtab. But this does not mean that you should just ignore it or get along with this fact. Because this is not the best option, due to the QSearch you can have problems with the Firefox, Chrome and Safari, undesired advertisements and even user data theft.

So, it’s very important to clean your machine of hijacker immediately. The few simple steps, which is shown below, will allow you to remove QSearch from the Firefox, Safari and Chrome and other web-browsers.

How to remove QSearch (Virus removal guide)

In the guide below we will have a look at the browser hijacker and how to get rid of QSearch from Mozilla Firefox, Google Chrome and Safari web-browsers for Apple Mac, natively or by using a few free removal utilities. Read this manual carefully, bookmark or print it, because you may need to exit your internet browser or restart your computer.

To remove QSearch, perform the following steps:

1. How to manually remove QSearch
2. Scan your computer and delete QSearch with free utilities

How to manually remove QSearch

Steps to remove QSearch hijacker without any software are presented below. Be sure to carry out the step-by-step instructions completely to fully remove this annoying QSearch .

Remove potentially unwanted applications using the Finder

First method for manual hijacker removal is to go into the Finder, then Applications. Take a look at the list of programs on your MAC and see if there are any questionable and unknown software. If you see any, you need to uninstall them. Of course, before doing so, you can do an Internet search to find details on the application. If it is a potentially unwanted program, adware or malicious software, you will likely find information that says so.

Open Finder and click “Applications”.

Very carefully look around the entire list of software installed on your Apple Mac. Most probably, one of them is the hijacker that causes browsers to open undesired QSearch website. If you’ve many applications installed, you can help simplify the search of harmful applications by sort the list by date of installation.

Once you’ve found a questionable, unwanted or unused program, right click to it and choose “Move to Trash”. Another method is drag the program from the Applications folder to the Trash.

Don’t forget, select Finder -> “Empty Trash”.

Remove QSearch virus from Firefox

This step will allow you remove QSearch, third-party toolbars, disable harmful extensions and revert back your default homepage, newtab and search provider settings.

First, open the Mozilla Firefox. Next, click the button in the form of three horizontal stripes (). It will open the drop-down menu. Next, press the Help button ().

In the Help menu click the “Troubleshooting Information”. In the upper-right corner of the “Troubleshooting Information” page click on “Refresh Firefox” button as shown in the following example.

Confirm your action, click the “Refresh Firefox”.

Remove QSearch from Google Chrome

If your Chrome web-browser is infected with QSearch virus, it may be necessary to completely reset your browser program to its default state.

Open the Google Chrome menu by clicking on the button in the form of three horizontal dotes (). It will display the drop-down menu. Choose More Tools, then click Extensions.

Carefully browse through the list of installed add-ons. If the list has the extension labeled with “Installed by enterprise policy” or “Installed by your administrator”, then complete the following guide: Remove Chrome extensions installed by enterprise policy otherwise, just go to the step below.

Open the Chrome main menu again, click to “Settings” option.

Scroll down to the bottom of the page and click on the “Advanced” link. Now scroll down until the Reset settings section is visible, as on the image below and click the “Reset settings to their original defaults” button.

Confirm your action, click the “Reset” button.

Remove QSearch from Safari

If you find that Safari internet browser settings such as home page, default search provider and new tab page having been hijacked, then you may revert back your settings, via the reset web browser process.

Run Safari browser. Next, select Preferences from the Safari menu.

First, click the “Security” tab. Here, select “Block pop-up windows”. It will stop some types of pop-ups.

Now, click the “Extensions” tab. Look for suspicious addons on left panel, choose it, then press the “Uninstall” button. Most important to remove all suspicious extensions from Safari.

Once complete, check your homepage and search provider settings. Click “General” icon. Make sure that the “Homepage” field contains the website you want or is empty.

Make sure that the “Search engine” setting shows your preferred search engine. In some versions of Safari, this setting is in the “Search” tab.

Scan your computer and delete QSearch with free utilities

There are not many good free anti malware applications with high detection ratio. The effectiveness of malware removal tools depends on various factors, mostly on how often their virus/malware signatures DB are updated in order to effectively detect modern malware, adware software, hijackers and other potentially unwanted programs. We suggest to use several applications, not just one. These programs which listed below will help you remove all components of the browser hijacker from your disk and system folders and thereby remove QSearch search.

Automatically remove QSearch vurys with MalwareBytes Free

You can remove QSearch automatically through the use of MalwareBytes Anti Malware (MBAM). We recommend this free malware removal utility because it can easily remove hijacker, adware, potentially unwanted software and toolbars with all their components such as files, folders and registry entries.

Visit the following page to download the latest version of MalwareBytes AntiMalware (MBAM) for Mac OS.

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After the download is done, close all windows on your Apple Mac. Further, open the saved file. Follow the prompts.

The MalwareBytes will automatically start and you can see its main window as shown on the image below.

Next, click the “Scan Now” button for checking your machine for the QSearch browser hijacker. Depending on your computer, the scan can take anywhere from a few minutes to close to an hour. When a threat is detected, the number of the security threats will change accordingly. Wait until the the scanning is finished.

When the scan is done, MalwareBytes Anti Malware (MBAM) will show you the results. In order to get rid of all threats, simply click “Remove Selected Items” button.

The MalwareBytes AntiMalware will remove QSearch hijacker infection.

How to stay safe online

It’s also critical to protect your web-browsers from harmful sites and ads by using an ad-blocking program such as AdGuard. Security experts says that it’ll greatly reduce the risk of malicious software, and potentially save lots of money. Additionally, the AdGuard may also protect your privacy by blocking almost all trackers.

Visit the following page to download AdGuard.

Once downloading is complete, start the downloaded file. You will see the “Setup Wizard” screen. Follow the prompts.

Each time, when you run your MAC OS, AdGuard will launch automatically and stop unwanted ads, block malicious or misleading sites.

Don’t know how your internet browser has been hijacked by QSearch hijacker?

QSearch hijacker usually spreads bundled with another program in the same install package. The risk of this is especially high for the various freeware downloaded from the Web. The makers of the programs are hoping that users will run the quick install type, that is simply to press the Next button, without paying attention to the information on the screen and don’t carefully considering every step of the installation procedure. Thus, the hijacker can infiltrate your machine without your knowledge. Therefore, it is very important to read all the information that tells the program during install, including the ‘Terms of Use’ and ‘Software license’. Use only the Manual, Custom or Advanced installation type. This method will allow you to disable all optional and unwanted programs and components.

To sum up

Now your MAC should be clean of the QSearch hijacker that redirects your web-browser to unwanted web-pages. We suggest that you keep AdGuard (to help you block unwanted popup advertisements and annoying harmful webpages) and MalwareBytes AntiMalware (to periodically scan your Apple Mac for new malicious software, browser hijackers and adware). Make sure that you have all the Critical Updates recommended for Mac OS. Without regular updates you WILL NOT be protected when new hijacker infections, malicious programs and adware are released.

If you are still having problems while trying to delete QSearch virus from your web-browser, then ask for help here.