Examkin

Soru

Zorluk: OrtaTroubleshooting Windows OS Startup and Boot Errors

A desktop computer running Windows 11 fails to boot after a user attaches a new external USB hard drive intended for system backups. Upon powering on the system, a black screen appears with the message 'No bootable device found. Press any key to restart.' The technician disconnects the external drive, and Windows boots normally. Which of the following is the most likely cause of this boot failure?

  1. The boot order in the system's UEFI/BIOS is set to check removable USB storage prior to the internal OS drive.Cevap
  2. B
    The Boot Configuration Data (BCD) store on the internal storage drive has corrupted boot entries.
  3. C
    The external hard drive requires a boot sector repair using the command bootrec /fixmbr.
  4. D
    The system partition requires an offline System File Checker scan to repair winload.efi.

Cevap

The boot order in the system's UEFI/BIOS is set to check removable USB storage prior to the internal OS drive.
The system attempting to boot from an external USB drive before checking the internal hard drive is a common cause of 'No bootable device found' errors. Because the external drive contains only backup data and no operating system, the firmware cannot find a bootable loader on that drive. Disconnecting the drive allows the firmware to fall back to (or directly target) the internal drive containing Windows, which boots successfully.

Adım Adım Çözüm

1
Analyze the reported boot symptoms and environmental changes.
The boot failure ('No bootable device found') occurs only when an external USB hard drive is connected.
Connecting hardware peripherals right before a boot issue indicates a hardware configuration or boot priority conflict.
2
Evaluate the result of disconnecting the peripheral.
Windows boots normally when the external USB drive is removed.
This confirms that the OS installation, BCD store, and internal drive binaries (winload.efi) are undamaged.
3
Determine the root cause based on motherboard firmware boot rules.
The firmware (UEFI/BIOS) is attempting to boot from the USB device first, which lacks a bootable OS installation.
Adjusting the boot order in UEFI/BIOS to place the internal storage drive first in the priority sequence resolves the issue permanently.

Anahtar Kavram

Improper UEFI/BIOS boot sequence leading to false missing boot device errors when external drives are connected.
Bu soruyu puanla

Konular

Troubleshooting Windows OS Startup and Boot Errors

Bu konudan daha fazla soru