How to Fix Windows Boot Manager Boot Failure [Complete Guide]

The Windows Boot Manager is the software that allows your computer to boot into the operating system. In some cases, the Boot Manager might fail to load the OS, preventing your computer from starting up normally. You may see an error message, or your system may get stuck on a black screen.

However, there are ways to fix the Windows Boot Manager boot failure. And if you have no idea how to do it, you've come to the right place. In this article, you will discover the best methods to boot Windows normally. Let's dive into the details!

Why does the Windows Boot Manager fail to start?

Before we proceed, it's important to understand why this event occurs. There can be multiple reasons why the Windows Boot Manager fails to start:

• Damaged Master Boot Record (MBR): The Master Boot Record (MBR) is a critical data structure located in the first sector of a hard drive. It contains boot-up code and a table listing the disk partitions. If the MBR is damaged, the boot manager may not be able to load the operating system.
• Damaged hard drive cable: If the cable connecting the hard drive to the motherboard is damaged, the boot manager may not be able to access the operating system files on the hard drive.
• Incorrect computer shutdown: If a computer is shut down improperly, it can lead to corruption or damage of system files that the boot manager relies on.
• Missing or incorrectly installed hardware: A missing or improperly installed hardware component can cause the boot manager to fail.

Boot failures are typically caused by issues that prevent the boot loader from loading the operating system. These issues can stem from either hardware or software problems and may require different solutions.

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Now that you know what the Windows Boot Manager boot failure is, you're probably wondering how to fix it. Let's explore that in the next section.

How to Fix the Windows Boot Manager Boot Failure

Looking for ways to fix the Windows Boot Manager not starting issue? This section is just for you! Here, you'll find some of the best methods to load your operating system correctly:

1. Solution 1: Repair the MBR
2. Solution 2: Fix the Bootloader
3. Solution 3: Edit the Windows Boot Manager
4. Solution 4: Update the BIOS or UEFI

Let's see how each method fixes the Windows Boot Manager boot failure error.

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Fix 1: Rebuild the MBR

If the Master Boot Record (MBR) is damaged or corrupted, it can cause the Windows Boot Manager to fail and prevent your computer from starting up properly. To fix this issue, you may need to rebuild the MBR. Rebuilding the MBR entails replacing the damaged or faulty MBR with a new, functioning one.

A tool that can be used to rebuild the MBR is the AOMEI Partition Assistant Professional. AOMEI Partition Assistant is a partition management software that offers various functions for managing hard disk partitions. It includes a feature to rebuild the MBR, which can repair or recreate the MBR on your hard drive. This is particularly useful in fixing issues where the Windows Boot Manager fails to start due to a damaged MBR.

With the Rebuild MBR feature of Partition Master, you can get rid of the damaged MBR and replace it with a new one so that the operating system can boot normally.

Step 1: Create a bootable WinPE disk

Launch Partition Master, and click “Boot Media” from the toolbar. Select “Create Bootable Media.” Click “Next” to finish.

Step 2. Boot the tool from the Partition Master Live USB

• Connect the bootable USB or CD/DVD to your computer.
• Restart your computer and press F2 or Del to enter BIOS setup. Set to boot from "Removable Device" or "CD-ROM Drive." The Partition Master tool will run automatically.

Step 3: Repair the MBR

Click on the Toolbox, and then choose Repair MBR.

Select the disk and MBR type, then click “Rebuild”.

Then you see "The MBR of Disk X has been successfully rebuilt."

You can also use the Diskpart commands in Windows to fix the corrupted MBR. However, using the Partition Master tool simplifies the process and you can easily fix your VAIO failed to start Windows issue.

Fix 2: Repair the Boot Manager

To fix the Boot Manager, you can use a tool called "Bootrec.exe" which is included in the Windows Recovery Environment (RE). Here's a step-by-step guide on how to use Bootrec.exe to repair the Boot Manager:

Step 1: Boot to the Windows installation media.

Step 2: Choose your language, time and currency formats, and keyboard or input method, then click “Next.”

Step 3: Use the arrow keys to select “Repair your computer,” and then click “Troubleshoot.”

Step 4: Click “Advanced options,” then click the “Command Prompt” option.

Click Command Prompt.

Step 5: Type bootrec.exe /fixmbr and press Enter. This will fix the Boot Manager.

Step 6: Type bootrec.exe /fixboot and press Enter. This will repair the boot sector.

Step 7: Type bootrec.exe /rebuildbcd and press Enter. This will rebuild the BCD.

Step 8: Remove the installation media, and then restart your computer. Your system should now boot properly.

Fix 3: Edit the Windows Boot Manager

Sometimes, the Windows Boot Manager can become damaged or corrupted, preventing the operating system from starting up correctly. By editing the Windows Boot Manager, you may be able to resolve issues like a corrupted boot configuration or incorrect boot order. To edit the Windows Boot Manager, follow these steps:

Step 1: Boot to your system using the Windows installation media.

Step 2: Choose your language, keyboard or input method, and time format, and then click "Next."

Step 3: Select “Repair your computer,” and then use the arrow keys to select “Troubleshoot.”

Step 4: Select “Advanced options,” then choose “Command Prompt.”

Step 5: Type bcdedit /? to view the editing commands.

Step 6: Type bcdedit /default to set the default boot entry.

With that command, your system should no longer have any boot issues.

Fix 4: Update the BIOS or UEFI

There are several benefits to updating your BIOS or UEFI (Unified Extensible Firmware Interface). It can fix errors, improve overall system performance, and enable support for new hardware or devices.

Here's how to update your BIOS or UEFI:

Step 1: Open the Microsoft Store and search for MSI Center.

Step 2: Click on the “Get” button to download it.

Click the “Get” button:

Step 3: Go to Support, then choose Advanced Options. Select BIOS Update and follow the instructions until it's done.

It's worth noting that updating a BIOS or UEFI carries some risk, because if something goes wrong, you can brick your system.

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Conclusions

In conclusion, we have elaborated on various repair methods for a regular OS boot, hoping that this helps you resolve the 'Windows Boot Manager failed to start' issue. These fixes can diagnose and resolve issues preventing the system from starting up normally.

To boost your system's efficiency, we recommend using Partition Master as a powerful tool for managing and optimizing your system's disk space. It can fix all partition errors, except for rebuilding the MBR.

Frequently Asked Questions About the "Windows Boot Manager Failed to Boot" Error

After learning how to fix the Boot error, you might still have some questions, which you can find the answers to below:

**How to fix the issue of Windows Boot Manager not starting?** When Windows Boot Manager fails to start, you can try the following steps to resolve the problem: 1. **Use System Recovery Options:** - Insert your Windows installation CD or USB drive and restart your computer. - During the startup process, enter the BIOS settings and set it to boot from the CD or USB. - Follow on-screen instructions to reach the installer, then choose your language and preferences. - Select "Repair your computer," then choose "Troubleshoot," followed by "Advanced options." - From there, attempt "System Restore," "Startup Repair," or "Command Prompt." 2. **Repair the Boot Sector:** - In Command Prompt, type `bootrec /fixmbr` and `bootrec /fixboot`. These commands help repair the Master Boot Record and boot sector. 3. **Use SFC (System File Checker):** - Run the command `sfc /scannow` in Command Prompt, which will scan for and fix any errors in system files. 4. **Reinstall the Boot Configuration Data (BCD):** - Open Command Prompt as an administrator and type `bcdedit /export C:\BCD_Backup` to create a backup. - Type `cd boot`, then `attrib bcd -s -h -r` to remove attributes from the BCD store. - Enter `ren c:\boot\bcd c:\boot\bcd.old` to rename the BCD file. - Input `bootrec /rebuildbcd` to create a new BCD store. If operating system instances are found, select [1] to add to the startup list. 5. **Check the hard drive connection and status:** - Ensure the hard drive is correctly connected; if necessary, try swapping data cables or interfaces. - Use hardware diagnostic tools to check for issues with the hard drive. 6. **Contact a professional:** - If none of these methods work, you may need professional technical support, as the issue could be a more profound hardware or software problem. Remember to back up important data before attempting these steps to prevent potential loss.

This article discusses four methods to fix the issue of Windows Boot Manager not starting. You can use the tool Partition Master to rebuild MBR:

Step 1: Launch AOMEI Partition Assistant, and click "Create Bootable Media" on the toolbar. Then choose "Create Bootable Media".

Step 2. Connect the bootable USB drive to your computer and press F2 to enter BIOS.

Click on “Tools” and select “Rebuild MBR”.

2. What is “Boot Manager Failed”?

When the bootloader fails to launch the operating system, it starts displaying error messages, or the system might get stuck on a black screen. This is called a bootloader failure.

3. How can I bypass the Windows Boot Manager?

You can fix the Windows Boot Manager boot and resolve this issue by following these steps:

Step one: Boot from the installation media and choose your language and keyboard layout.

Step 2: Select “Repair your computer” > “Troubleshoot” > “Advanced options” > “Command Prompt.”

Step 3: Type bootrec.exe /fixboot and press Enter.

Step 4: Type bootrec.exe /fixmbr and press Enter. Type bootrec.exe /rebuildbcd and press Enter again.