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Difficulty: MediumTroubleshooting Windows OS Startup and Boot Errors

Following a sudden system power failure, a Windows 10 desktop computer using Legacy BIOS and MBR partitioning fails to boot, displaying the message "BOOTMGR is missing". A technician boots into the Windows Recovery Environment (WinRE) Command Prompt and verifies that the physical hard drive is recognized and the Master Boot Record is intact. Which of the following commands should the technician execute to write a new boot sector to the system partition?

  1. bootrec /fixbootAnswer
  2. B
    bootrec /fixmbr
  3. C
    bootrec /rebuildbcd
  4. D
    sfc /scannow

Answer

The technician should execute the `bootrec /fixboot` command.
The command `bootrec /fixboot` writes a new boot sector onto the system partition using a boot sector compatible with Windows. This resolves the "BOOTMGR is missing" error by restoring the boot code responsible for invoking the Windows Boot Manager.

Step-by-Step Solution

1
Diagnose the boot failure error message.
The message "BOOTMGR is missing" on an MBR system indicates that the volume boot sector code on the system partition is missing, corrupted, or incompatible.
Identifying whether the issue lies in the MBR, boot sector, BCD database, or system files narrows down the proper repair command.
2
Select the correct `bootrec` command switch in WinRE Command Prompt.
Executing `bootrec /fixboot` writes a fresh Windows-compatible boot sector onto the active system partition.
This specific command repairs the partition volume boot code needed to locate and load BOOTMGR upon startup.

Key Concept

Repairing Volume Boot Code with Bootrec in Windows Recovery Environment
Estimated Time:1m 30s
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Topics

Troubleshooting Windows OS Startup and Boot Errors

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