How to troubleshoot Windows Boot Manager

Last update: 07/02/2025
Author Isaac
  • Identify the main causes such as MBR damaged or incorrect settings in BIOS.
  • Repair MBR and rebuild BCD using recovery environment.
  • Update BIOS/UEFI to avoid compatibility issues with the hardware.

windows boot manager

El Windows Boot Manager is a fundamental part of the operating system that allows your computer to boot properly. However, it is not uncommon for users to encounter problems that prevent their system from starting properly, displaying error messages or getting stuck on black screens.

From errors in the MBR to erroneous configurations in the BIOS, the causes can be varied, but the important thing is to know the available solutions. In this article, we will explain in detail the steps to follow to solve these problems, ensuring that your computer works again without complications.

Possible causes of Windows Boot Manager failure

Several reasons can cause Windows Boot Manager to not work properly. Among the most common problems we find:

  • Corrupted Master Boot Record (MBR): This is one of the main reasons for this failure and usually requires repair or rebuilding.
  • Faulty hardware connections: Loose or damaged cables can disrupt access to the hard drive where the operating system is located.
  • Interrupted updates: Partial or incorrect installation of system updates can lead to boot issues.
  • Corrupted system files: Both the boot sector and other essential data can be damaged by power outages or malware infections. malware.

How to identify and fix bootloader errors

Before applying any advanced solutions, it is essential to perform some initial checks:

  • Make sure that there are no external devices connected (such as memory cards). USB or external hard drives) that may be creating conflicts.
  • Check that the cables SATA and eating hard drive are properly connected.
  • Restart your computer to see if the error persists.

If basic checks don't resolve the issue, it's time to try more specific methods to fix the error.

  How to fix FIFA 19 server issues and join the Weekend League

Repair the MBR and rebuild the BCD

The Master Boot Record (MBR) and Boot Configuration Data (BCD) are critical to proper system startup. If they are corrupted, you can use commands specific to repair them:

  1. Access the Windows recovery environment using installation media or a USB drive Bootable USB.
  2. Select “Repair your computer” and then “Advanced options.”
  3. Open the "Symbol of the system» and type the following commands:
    • bootrec / fixmbr – Repair the MBR.
    • bootrec / fixboot – Restore the boot sector.
    • bootrec / RebuildBcd – Rebuild the BCD file.

After completing these steps, restart your computer to see if the problem is resolved.

Update BIOS or UEFI

Your computer's firmware plays a key role in managing system startup. If it is outdated, it may cause problems when managing the Windows Boot Manager. Proceed with caution when updating it:

  • Visit your motherboard or computer manufacturer's website.
  • Follow the specific instructions provided to update the BIOS or UEFI.
  • Please backup your data before proceeding, as a mistake during the update can cause serious damage.

Restore the operating system

Sometimes performing a system restore can be the most effective solution. This method is useful after failed updates or recent errors:

  1. Access the Windows recovery environment.
  2. Select “Repair your computer” and then “System Restore.”
  3. Choose a restore point prior to when the problems started and start the process.

Other advanced methods

If the above solutions do not work, there are additional methods that may help resolve the error:

  • Repair boot configuration using tools like EaseUS Partition Master.
  • Replace file bootmgr if it is corrupted, copying it from the installation media to the system reserved partition.
  • Examine the HDD with diagnostic tools to detect bad sectors.

Common mistakes and their quick solutions

Some error messages are especially common when the bootloader fails. Here's how to deal with them:

  What is the Windows inetpub folder? Everything you need to know and why you shouldn't delete it.

BOOTMGR is missing

This error usually appears when starting the computer and is due to a problem in the boot sector. To solve it:

  • Insert installation media and select “Repair your computer.”
  • Use the “bootrec” command in the command prompt to rebuild the MBR.

Boot device not found

This usually indicates that the hard drive is not being detected. Troubleshoot the problem by checking the hardware connections and setting the boot order in the BIOS.

By following these recommendations, you can resolve most issues related to Windows Boot Manager and ensure that your operating system boots without any problems. If none of these solutions are suitable, consider consulting a specialized technician to avoid further complications.

Leave a comment