What is BOOT-DEVICE-NOT-FOUND?
Boot Device Not Found shows up as a critical-severity hardware BIOS/UEFI fault. The BIOS/UEFI firmware cannot locate a bootable operating system partition or storage drive. Reports of Boot Device Not Found usually describe a sudden crash, brief unresponsiveness, or a stop-code screen appearing out of nowhere. The steps below are ordered to resolve this efficiently.
Common Causes
- Disconnected storage drive SATA or NVMe cables
- Corrupted boot files (MBR or BCD)
- Failed hard drive or SSD
Step-by-Step Fix Guide
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1
Check physical SATA/power/NVMe connection
As a first move, Check physical SATA/power/NVMe connection handles the most common scenario behind Boot Device Not Found.
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2
Repair MBR/BCD via Windows Installation USB
In case symptoms recur, the rest of the sequence deals with the less common side of bios instability.
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3
Check drive health status in BIOS
If earlier steps didn't help, "Check drive health status in BIOS" directly addresses disconnected storage drive SATA or NVMe cables.
Commands & Diagnostics
bootrec /fixmbr
bootrec /rebuildbcd
Frequently Asked Questions
The leading cause of BOOT-DEVICE-NOT-FOUND is disconnected storage drive SATA or NVMe cables, though corrupted boot files (MBR or BCD) and failed hard drive or SSD also show up in our reports.
Try "Check physical SATA/power/NVMe connection" first — it resolves most BOOT-DEVICE-NOT-FOUND cases on its own. Only work through the rest of the guide above if it comes back.
Treat BOOT-DEVICE-NOT-FOUND as urgent — it's flagged critical severity, meaning repeated occurrences risk data loss or hardware damage.
In most cases, yes — the guide above resolves BOOT-DEVICE-NOT-FOUND without a clean install. Treat a reinstall as the last resort, not the first move.
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