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Difficulty: EasyTroubleshooting Windows OS Startup and Boot Errors

A Windows desktop fails to start following a power failure, displaying the error message 'BOOTMGR is missing. Press Ctrl+Alt+Del to restart.' A technician boots the system into the Windows Recovery Environment (WinRE) Command Prompt to repair the boot sector. Which command should the technician run to write a new Master Boot Record (MBR) to the system partition?

  1. bootrec /fixmbrAnswer
  2. B
    bootrec /rebuildbcd
  3. C
    chkdsk /r
  4. D
    sfc /scannow

Answer

The command bootrec /fixmbr writes a new Master Boot Record to the system partition.
The bootrec /fixmbr command directly writes a Windows-compatible Master Boot Record (MBR) to the system partition. This resolves initial bootloader failures such as 'BOOTMGR is missing' caused by MBR corruption.

Step-by-Step Solution

1
Identify the boot error symptom
The message 'BOOTMGR is missing' indicates that the Master Boot Record or boot sector code responsible for locating the boot manager is missing or corrupted.
Understanding the failure point isolates the issue to initial MBR/boot sector loading rather than Windows kernel startup.
2
Select the appropriate recovery tool and flag
Using bootrec with the /fixmbr parameter writes a standard, compatible MBR to the drive's master boot sector without altering existing partition tables.
This repairs the corrupt bootloader code allowing BOOTMGR to load properly.

Key Concept

Repairing MBR Startup Files with bootrec
Estimated Time:45s
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Topics

Troubleshooting Windows OS Startup and Boot Errors

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