BSOD with INACCESSIBLE_BOOT_DEVICE at startup
Windows kernel loses access to the system partition during early startup due to changed storage controller modes or missing AHCI/NVMe drivers.
Internal desktop parts run on harmless 12V DC voltage and cannot shock you. Simply unplug the wall power cable first, then touch the unpainted metal case frame to ground static electricity.
Common Symptoms & Tells
- Blue screen with stop code INACCESSIBLE_BOOT_DEVICE
- Immediate reboot after splash screen into automatic repair
- Occurs after update or motherboard replacement
Interactive Fix Checklist
0 of 5 steps completedVerify SATA / NVMe mode in BIOS (AHCI vs RAID / VMD)
Enter and locate SATA Operation or Intel VMD. If a prior firmware update or reset reverted the storage controller from AHCI to RAID/VMD (or vice versa), switch it back to your original configuration.
Boot into Safe Mode once to reload storage drivers
Safe Mode loads generic Microsoft storage drivers. Booting into Safe Mode once often clears driver binding conflicts and allows normal boots thereafter.
Run CHKDSK from Windows Recovery Environment
Open Command Prompt from Advanced Startup and run 'chkdsk C: /f /r' to repair corrupted file system structures on the boot partition.
Check system file integrity with SFC
In Recovery Command Prompt, run 'sfc /scannow /offbootdir=C:\ /offwindir=C:\Windows' to replace corrupted kernel storage drivers.
Inspect physical drive seating (Safety Protocol)
If software repair fails, shut down the PC, switch off the (O), disconnect the AC power cable, and hold the power button for 15 seconds to discharge residual power. Verify that SATA data and power cables are fully locked in place, or reseat the M.2 NVMe firmly into its slot and retighten the retaining screw.
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