Access Inaccessible_boot_device

Jun 10, 2006
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I have an HP DL 380 domain controller which crashed during upgrade. So I reinstalled windows 2000 and did a system restore. And it crashes when loading mup.sys with error

STOP: 0x0000007B (0xFC23948,0x00000034,0x00000000,0x00000000) INACCESSIBLE_BOOT_DEVICE

I have followed this article:

and still no joy.

Before restoring there is no problem.

I have followed it and still the BSOD appears at the same position. Please can you help me.

Thank you


Dec 13, 2008
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I experience the same dreaded Mup.sys stop and reboot problem
In server environment I think when you looked at the ntbtlog.txt inside Windows or WINNT folder
You see Service Pack 210 18 2008 14:07:03.375
Loaded driver \WINDOWS\system32\ntkrnlpa.exe
Loaded driver \WINDOWS\system32\hal.dll
Loaded driver \WINDOWS\system32\KDCOM.DLL
Loaded driver \WINDOWS\system32\BOOTVID.dll
Loaded driver ACPI.sys
Loaded driver \WINDOWS\system32\DRIVERS\WMILIB.SYS
Loaded driver pci.sys
Loaded driver isapnp.sys
Loaded driver pciide.sys
Loaded driver \WINDOWS\system32\DRIVERS\PCIIDEX.SYS
Loaded driver MountMgr.sys
Loaded driver ftdisk.sys
Loaded driver dmload.sys
Loaded driver dmio.sys
Loaded driver PartMgr.sys
Loaded driver VolSnap.sys
Loaded driver atapi.sys
Loaded driver disk.sys
Loaded driver \WINDOWS\system32\DRIVERS\CLASSPNP.SYS
Loaded driver fltMgr.sys
Loaded driver sr.sys
Loaded driver TfSysMon.sys
Loaded driver TfFsMon.sys
Loaded driver REDLIGHT.SYS
Loaded driver Fastfat.sys
Loaded driver KSecDD.sys
Loaded driver NDIS.sys
Loaded driver Mup.sys
Did not load driver ACPI Multiprocessor PC
Did not load driver Audio Codecs

Since I do not need audio to be enabled I suspect it is ACPI section of the registry

The setting may have been incompatible with the loaded hal.dll at Bios startup and hence Windows cannot identify
the correct driver to load and hang....

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