INNACCESSIBLE_BOOT_DEVICE

No repair is needed if the computer restarted normally and the error has not returned; Microsoft states that a single Windows 11 stop-code event is usually resolved by the restart. ^1^

INACCESSIBLE_BOOT_DEVICE means Windows temporarily lost access to the system partition while starting. Possible areas involved include the storage device, its controller or driver, firmware, or storage configuration, but one occurrence does not establish which one caused it. ^2^

What to do now

• Continue using the computer normally.
• Because it is brand-new, avoid changing BIOS/UEFI storage settings.
• Keep a backup of important files once you begin storing data on it.
• Record or photograph the screen if the same stop code appears again.

If it happens again

1. Open Start → Settings → Windows Update → Check for updates, install available updates, and restart. Microsoft recommends this when stop-code errors recur. ^1^
2. If the error repeats—especially during startup—or Windows stops loading, contact the computer manufacturer or retailer under the warranty/return policy. Tell them that a new computer repeatedly reports INACCESSIBLE_BOOT_DEVICE.
3. Do not perform a clean installation or registry repair for a single resolved event. If the machine becomes unable to boot, manufacturer service is preferable on a newly purchased device because this stop code can involve storage hardware or its controller. ^2^

References

1. Windows 11
2. Bug check 0x7B: INACCESSIBLE_BOOT_DEVICE