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Difficulty: MediumTroubleshooting Windows OS Startup and Boot Errors

A user reports that following an abrupt power failure, a desktop computer fails to start and displays the error message 'Operating System Not Found' on a black screen. An IT technician boots the computer into the Windows Recovery Environment (WinRE) Command Prompt and confirms that the system uses a Master Boot Record (MBR) partition scheme. Diagnostics indicate that the partition structure is undamaged, but the boot loader code located in the MBR is corrupted. Which command should the technician run to write a new master boot record to the system partition without altering the existing partition table?

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

Answer

The command 'bootrec /fixmbr' should be executed to write a new MBR-compatible Master Boot Record to the system partition.
Executing 'bootrec /fixmbr' writes a standard, uncorrupted Master Boot Record code to the system disk, fixing startup errors caused by corrupted MBR code without disturbing the partition table.

Step-by-Step Solution

1
Identify the root cause from the scenario symptoms and diagnostics.
The system fails to locate the OS due to corrupted Master Boot Record code on an MBR-partitioned disk after a sudden shutdown.
Understanding the specific boot stage failure distinguishes MBR boot code corruption from BCD store, boot sector, or file system corruption.
2
Select the specific bootrec parameter targeted at Master Boot Record code replacement.
The '/fixmbr' switch overwrites only the master boot record code while keeping the existing partition table intact.
Using '/fixmbr' resolves the 'Operating System Not Found' error without risking data loss on existing drive partitions.

Key Concept

Master Boot Record (MBR) Repair via Bootrec Utility
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Topics

Troubleshooting Windows OS Startup and Boot Errors

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