How to fix 'BOOTMGR is missing' error?
The "BOOTMGR is missing" error is usually caused by an incorrect startup sequence or a corruption of the boot file. The repair methods include: 1. Enter the BIOS to ensure that the hard disk is the first boot item and unplug the external device; 2. Use the Windows installation media to execute the bootrec /fixmbr, bootrec /fixboot and bootrec /rebuildbcd commands to repair the boot; 3. Check the partition status through diskpart, run chkdsk /f /r to fix the hard disk problem. If it is invalid, you may need to reinstall the system or replace the hard disk.
"BOOTMGR is missing" is a common Windows startup error that usually occurs when the computer is powered on or loaded. This problem is generally not caused by hardware failures, and can be fixed in most cases through a few simple steps.

1. Check the order of starting devices
The most common reason is that the device that is preferred to boot in the BIOS/UEFI settings is wrong. For example, if you plug in a USB drive or a mobile hard drive, the system may try to boot from these devices, but if the boot information is not found, an error will be reported.
- Enter BIOS (press F2, F10, Del or other specified keys when powering on)
- Find the Boot tab
- Make sure that the hard drive (such as Windows Boot Manager) is the first startup item
- Save and exit
Unplug unnecessary external devices and try restarting, and the problem is often solved.

2. Repair the boot using the installation media
If the startup sequence is OK or there is an error, it may be that the boot file is corrupted or lost. At this time, you can use Windows to install USB disk or CD to repair:
- Insert the installation media and boot from it
- Select the language and "Next" and click "Fix Computer"
- Select "Troubleshoot → Advanced Options → Command Prompt"
- Enter the following command in turn and press Enter:
bootrec /fixmbr bootrec /fixboot bootrec /rebuildbcd
These three lines of commands repair the main boot record, write the boot sector, and rebuild the BCD (boot configuration data). Exit and restart when finished.

3. Check whether the hard disk is abnormal
If the above method is useless, there may be some problems with the hard disk itself, such as the partition table is damaged or the system partition is deleted by mistake.
- You can run
diskpart
at the command prompt to view partition status - Ensure that the system partition exists and is marked "Active"
- If the hard drive has bad channels or file system errors, you can try using
chkdsk /f /r
to check for repair
This type of problem is relatively rare, but if none of the previous methods work, you may need to consider reinstalling the system or replacing the hard drive.
Basically these common solutions. Most of the time, you can confirm the startup sequence first, and then repair the boot. The key is to have a Windows installation disk backup, otherwise you can't even enter the command prompt.
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