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After you have fixed the macOS Big Sur update stuck problem, you can enjoy the salient new features of Big Sur. But at the same time, some new troubles might trouble you as well, such as like macOS Big Sur running slow, some apps get damaged or non-Apple Apps cannot be opened, Safari crashed, Mac gets overheated, or the Big Sur keeps logging you out etc. New World Mac serves the greater Los Angeles area with prompt, honest, and courteous Mac computer and technology support. Visit us or call us for a free consultation or diagnosis. We are Yelp’s highest-rated Apple / Mac laptop/desktop repair shop in Los Angeles! But don’t take our word for it. Read the reviews.

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Many Mac users have reported the same problem: Mac stuck on the login screen, even for the macOS Big Sur.

Commonly, Mac like MacBook Pro stuck on the login screen may because:

1. The mouse won't move and you can't type in your login password
2. Mac freezes at login screen with a spinning wheel
3. Mac doesn't accept the right login password
4. You forget the login password and type the wrong one

Usually, a force and hard reboot might fix the problem. If not, the solutions are usually more complicated.

And there's a high risk of data loss when Mac stuck on the login screen. So, you'd better recover your data from your Mac first.

Then, confirm your situation and try the solutions in this post to fix your Mac that can't load past the login screen.

How to prevent data loss when Mac stuck on login screen?

You can watch this video to learn how to recover files from a Mac or MacBook that stuck on the login screen and won't boot up.

To recover data from Mac that won't load past the login screen, using data recovery software is the only way if you have no backups.

iBoysoft Data Recovery for Mac (Support Apple Silicon M1 Mac and macOS Big Sur) is highly recommended.

This data recovery software would be helpful to recover data from the Mac that can't log in. And for safe and quick data recovery, it's required to run iBoysoft Data Recovery in macOS recovery mode.

Don't want to read the detailed data recovery steps? Please watch the above video.

Two situations your Mac/MacBook gets stuck on login screen

Before you go further, you should know there are two kinds of Mac login stuck situations. It depends on if you have enabled FileVault to encrypt your startup drive.

1 Mac won't load past login screen after entering password

It happens to users who encrypt the system drive. You'll be asked for a password before you see the progress bar. Then, the loading bar may stop somewhere between 50% and 75%, or even 100%.

Your Mac won't let you log in with the right password because of a Kernel program incompatibility, file system corruption, or some core data lost.

In this case, the password is usually accepted, and you need to check this post: Mac is stuck on loading screen for a solution.

2 Mac won't accept password or you can't enter password in sign in screen

Another case is that the startup is not encrypted by FileVault or APFS feature.

Assuming that you use a MacBook Pro, you'll see the loading bar first. But the MacBook Pro's login screen may not appear or gets stuck. MacBook Pro won't accept password but freezes with a spinning wheel or you are unable to type in password. Even in the macOS Recovery, Mac also won't accept your password.

This MacBook Pro stuck on login screen issue is usually caused by software conflicts, frozen software, or configuration errors. It happens especially after you update to macOS Big Sur.

What to do when Mac won't load past login screen?

Anyhow, no matter what situation you've run into, these methods would help you fix the Mac (like MacBook Pro) stuck on login screen issue.

Solution 1: Bypass Login items at startup

In some cases, it's software that stops you from getting to your Mac. Then, you can try these steps to sign in your iMac or MacBook.

• 1. Start your MacBook normally.
• 2. On the sign in page, enter the admin account and password if you can, but DON'T click on Log in immediately (in case of a login loop).
• 3. Press and hold the Shift key to stop frozen apps launching. And then, you can click on the Login button.

Solution 2: Boot your Mac in Safe Mode

Booting Mac into Safe Mode will only launch necessary programs. It's efficient to isolate incompatible software and repair some errors when Mac login window not responding.

To boot an Intel-based Mac into Safe Mode:

• 1. Press and hold the Shift key while tapping the power button to restart your Mac.
• 2. Release the Shift key till you see the Apple logo and loading bar.

To boot an Apple Silicon M1 Mac into Safe Mode:

• 1. Completely shut down your Mac and wait 10 seconds around.
• 2. Press and hold the power button until you see the startup disk icon and gear icon with Options.
• 3. Press and hold the Shift to continue booting M1 Mac to Safe Mode, then try to uncheck login items.

If your Mac loads successfully in Safe Mode, try to uncheck login items in Users & Groups. Click the Apple icon > System Preferences... > Login Items.

Sometimes Apple computer won't let you login to Safe Mode because FileVault is enabled. You could decrypt your startup drive temporarily by booting Reset Password Assistant. This makes Safe Mode be able to check and repair errors before the login window appears.

If you succeed in turning off FileVault, you can restart your Mac normally. Then you can see if it brings up the login window. But if the progress bar is stuck underneath the Apple icon, you can try Safe Mode again after turning off the FileVault.

Solution 3: Reset NVRAM / PRAM

NVRAM, as well as PRAM, is a small amount of memory that your Mac uses to store certain settings and access them quickly. Thus, whenever your Mac is not booting up, you can try to reset the NVRAM / PRAM.

Now, restart your Mac and simultaneously press Command + Option + P + R keys for about 20 seconds until your Mac restart automatically.

NVRAM is available on M1 Mac, but it automatically runs during startup and automatically reset the NVRAM if needed.

Solution 4: Boot your Mac into macOS Recovery mode

Mac could stuck on the login progress bar in a normal startup. But if you can boot into macOS Recovery Mode, you could troubleshoot this issue more easily.

Recovery mode, sometimes called sigle-user mode, is a lite built-in macOS utility to check and repair some system issues.

To boot into macOS Recovery Mode:

Booting M1 Mac to macOS Recovery Mode is different from the following steps for Intel Macs.

• 1. Press and hold the power button until the Mac turns off.
• 2. Restart the Mac and immediately press and hold the Command and R keys.
• 3. Release those keys when you see the loading bar.

Mac Recovery Mode Not Working, How to Fix?

Occasionally, macOS Recovery mode may not work on your MacBook Pro, Mac mini, MacBook Air, and iMac. Read this post to check what you can do. Read more >>

If you successfully boot into macOS Recovery Mode, you'll see a macOS Utilities screen. (In some old system, it's called Mac OS X Utilities.) Then, you can do several things to fix the Mac stuck on login screen issue.

1. Repair the startup drive in Disk Utility

Probably, the Mac won't past the Apple logo or login screen because of file system or disk errors. Fortunately, you can check for and repair errors with the built-in tool First Aid.

2. Reset password

Mac could be stuck on the login screen after you forget Mac's password. If you've entered the wrong password too many times, the system could be locked. Then the Mac won't accept the password even it's the right one.

In this case, you should reset your password first. Apart from other ways, resetting your login password via Terminal is a common way.

• 1. In macOS Recovery mode, open the Terminal by clicking Utilities > Terminal in the top menu bar.
• 2. At the Terminal prompt, type resetpassword, and then hit Return / Enter.
• 3. Follow its onscreen wizard to reset the password.

With the password hint, you can change the password of a non-encrypted account. Then you can restart your Mac and log in to your Mac again.

3. Check and fix user preference settings

Sometimes, the .plist files related to user preferences could be changed. Then, your login information would not be accepted.

In this case, you can use the mv command in Terminal to rename the preference folder. And you can troubleshoot and nuke the problematic .plist file easily.

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The other times you can't log in to the Mac just because the access to the user directory was changed. You can run chmod to change the access permission.

4. Reset launch services database

If the Mac gets stuck on the login screen and won't accept the password, you can remove the .csstore file ( a launch services database) in Terminal and fix the problem.

1. 1. Open Terminal in macOS Recovery mode.
2. 2. At the Terminal prompt, type the following command, and then hit Return / Enter.
3. 3. Remove every .csstore file you can find by rm command.

Hopefully, you can log in to your Mac after a rebooting.

5. Reinstall macOS in macOS Recovery mode

If you see a folder with question mark on the Mac, or get stuck at 'Create a computer account' on your M1 MacBook Air or M1 MacBook Pro, you can simply reinstall macOS to reset your Mac that can't log in.

But reinstall macOS may make your important data loss, you'd better recover data from your Mac before reinstalling macOS.

• How to reinstall macOS on your Mac

• How to reinstall macOS Big Sur on M1 Mac

This will be helpful especially if you need to downgrade from a recent macOS Big Sur update to macOS Catalina.

How to Reset your M1 Mac when it stuck on login screen?

Ways to factory reset your M1 Mac mini, MacBook Air, and MacBook Pro and reinstall macOS Big Sur when the Mac frozen at login screen. Read more >>

Whether your Mac won't let you in with the right password or you even can't enter a password, this post will give you solutions. By the way, don't neglect data recovery when your Mac stuck on the login screen. Or, you'll face permanent data loss.

Macintosh HD, or the MacBook internal hard drive, is basically the startup drive of most Apple computers. That means if your Mac or MacBook Pro can’t mount its startup disk, it is likely that you will experience problems, like your computer gets stuck on the login screen or it does not boot at all. Situations like this can be very annoying, especially if you have critical and important files stored on the “unmountable” hard drive.

Fret not, because we will teach you what to do if your MacBook Pro won’t mount its startup disk. But before we do that, you better have a backup of all your data.

Backup, Backup, Backup!

Before you proceed with fixing the problem, it is best that you back up all your data first. That way, you can easily retrieve or recover your important documents and files in case something goes wrong.

Now, you might be wondering if it is possible to create a backup of your data, especially that your Mac is not even booting. Here’s what you should know: your Mac has a built-in Disk Utility, which can be accessed before startup. To use this, follow the steps below:

Pro Tip: Scan your Mac for performance issues, junk files, harmful apps, and security threats
that can cause system issues or slow performance.

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1. Get an external hard drive and connect it to your Mac.
2. Switch off your Mac. After five seconds, switch it back on.
3. After hearing the startup sound, press the CMD and R keys. Hold them until the Apple logo appears.
4. The macOS Utilities window will now appear.
5. Choose Disk Utility and hit Continue to proceed.
6. You can now start backing up your data using the external drive. Once you have backed up all your data, you can try a few fixes to your “unmountable” hard drive problems.

4 Fixes to a MacBook Pro That Can’t Mount Its Startup Disk

In most cases, mounting is an automatic process that happens as soon as the hard drive is connected to a Mac or MacBook Pro. Then again, drive mounting can be performed manually using the Disk Utility of your machine. It will be discussed further below.

Going forward, assuming you already have a backup of your important files and data, let’s proceed with resolving the problem. Below are a few ways to fix a MacBook Pro that can’t mount its startup disk:

1. Fix Your Hard Drive.

Sometimes, restarting your Mac is more than enough to fix the problem. However, if that does not work, then you might want to look into the angle that there might be something wrong with your hard drive. If that is the case, you have to boot your MacBook Pro in Recovery Mode via Disk Utility.

To hopefully fix your hard drive, follow these steps:

1. Switch off your MacBook Pro.
2. Turn it back on by pressing the Power button. But while doing that, press the CMD and R keys as well until the Apple logo appears.
3. The macOS Utilities window will open. From there, select Disk Utility.
4. From the left pane, choose your MacBook Pro hard drive.
5. Navigate to the First Aid tab.
6. Click the First Aid button to start fixing your drive.
7. Wait for the process to finish before restarting your machine.

2. Run Your MacBook Pro in Safe Mode.

When booted in Safe Mode, your MacBook Pro will start only with the minimum requirements and utilities needed. All other programs and apps that are unnecessary will never be loaded. Hence, if the reason why your startup disk cannot be mounted is a faulty app or program, booting your MacBook Pro in Safe Mode might just fix your problem.

To run your MacBook Pro in Safe Mode, do these:

1. Restart your MacBook Pro.
2. After you hear the startup sound, press the SHIFT key immediately. Continue holding it until the Apple logo appears.
3. If your MacBook Pro boots up properly, then uninstall any program or app you suspect is causing the problem.
4. Restart your machine.

3. Disconnect All External Peripherals.

It is possible that a faulty peripheral connected to your MacBook Pro could be causing your startup disk problems. To verify this, follow the steps below:

1. Switch off your machine.
2. Disconnect all external peripherals connected to your MacBook Pro, including printers, external hard drives, USBs, and scanner. You may leave the keyboard and mouse attached in the meantime.
3. Switch on your Mac. If it boots properly, then one of the peripherals is causing the problem.
4. Identify the exact cause of the problem by connecting each of the peripherals one by one. Make sure you reboot your MacBook Pro every time you connect a peripheral.

4. Reset the SMC and PRAM.

This may sound like a technical solution, but it isn’t. In fact, resetting the SMC and the PRAM takes only a few seconds.

To reset the PRAM and SMC, follow these instructions:

1. Reboot your MacBook Pro.
2. After you hear the startup sound, press the Option, CMD, P, and R keys. Hold them until you hear the second startup tone.
3. Release the keys. Your PRAM will then be reset.
4. Restart your MacBook Pro and check if the problem persists.
5. If resetting the PRAM does not fix the problem, try resetting the SMC. Start by shutting down your MacBook Pro.
6. Plug your machine into a wall outlet.
7. Next, press the CTRL, SHIFT, Option, and Power keys for 10 seconds and release them together.
8. Restart your MacBook Pro and see if it worked.

How to Mount a Startup Disk on MacBook Pro

At this point, you probably want to know how to properly mount a startup disk on your MacBook Pro to avoid problems in the future. Well, mounting a startup disk does not literally suggest physically setting it up with all the wires. It simply means making the startup disk available for your system to perform different read and write operations.

If the startup drive is in good shape, your system Disk Utility should see it. Under the Disk Utility window, select your preferred startup disk. Click on it to mount. By now, your new startup disk should be accessible by your operating system.

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What’s Next?

Now that you know how to deal with your “unmountable” startup disk problem, it’s time that you get your MacBook Pro running fast and smooth by downloading and installing a reliable tool like Outbyte MacRepair. Not only will this tool allow you to conveniently find and fix speed and stability problems, it will also protect your privacy. What more can you ask for from such a powerful tool?

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If you know other ways to fix a MacBook Pro that can’t mount its startup disk, please share them with us below. We’re looking forward to hearing from you.