When this issue happens, you will see the following interface.
Step 1: Preparations
Step 2: Create a USB Recovery Drive
1.
Connect the USB drive to the normal working computer via a USB port.

- launch the software on the normal running Mac computer.
Click theClick herelink next toCreate Recovery Driveon the bottom of the software interface.
On the pop-up interface, opt for target USB drive.
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ClickCreate Recovery Driveto continue.
When the creation process ends, clickOKto exit.
Unplug the USB drive.

Step 3: Rescue Your Mac Data
1.
Press thePowerbutton and immediately press & hold theOptionkey.
Release the key when you see the startup manager screen.

- you might see all the drives that are connected.
opt for USB Recovery Drive and press theReturn key.
Then, your Mac will boot from the selected USB recovery drive
5.

When you see the software interface, you gotta grab the data types you want to rescue.
- grab the drive you want to recover data from.
The software begins to scan the selected drive.

This process will last for a while.
You should wait until the whole process ends.
After scanning, you could see the scan results including both the existing and deleted files on your Mac.

you’re able to select your needed files to recover.
If you are not sure, you might double-nudge the file to preview it and make a confirmation.
Then, clickSaveto store the files to the selected drive.

It wont cost you a lot of time.
you’re free to just have a try.
Check whether your Mac can normally boot up this time.
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To rule out this possibility, you should remove all the third-party devices from your Mac.
Then, it’s possible for you to try the next method.
If the issue persists, you’re able to try the next solution.
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The ways to start up an Intel-based Mac and a Mac with Apple silicon in safe mode are different.
So, it’s crucial that you verify that your preferred start-up disk is selected.
After these steps, the issue should be solved and your Mac should be able to boot normally.

you’ve got the option to use Disk Utility to fix it.
If the result is positive, everything is OK now.
If not, you will need to reinstall macOS.
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you’re free to still do this job in Mac Recovery Mode.
After the reinstallation, the issues should disappear and you could normally boot your Mac.
In this post, we will show you some effective solutions.
you’re free to contact Apple Support for help.
If necessary, you may need to replace the damaged start-up disk.