Windows 10: INACCESSIBLE BOOT DEVICE on startup Solved

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  1.    17 Jan 2018 #1

    INACCESSIBLE BOOT DEVICE on startup


    Hello! I've just tried turning on my PC and it shows me a BSOD saying INACCESSIBLE BOOT DEVICE. Yesterday everything was fine. I turned it off normally like always. I haven't updated any drivers either and there are no external drives or USBs connected. I liked for some solutions but none worked. I tried booting into safe mode (got the same error), I checked if my SATA options werr on AHCI (which they were). What do I do? I don't want to lose all my data!
      My ComputerSystem Spec


  2. Posts : 19,920
    windows 10 professional version 1607 build 14393.969 64 bit
       17 Jan 2018 #2

    Please update the computer specs in the "MY Computer" section.
    System Specs - Fill in at Ten Forums:
    System Specs - Fill in at Ten Forums Site Use Tutorials
    In the left corner below in your post you find 'My System Specs'.
    After clicking it you can find a link a little below that says 'Update your System Spec', click on this link to get to the page where you can fill in your system specs.
    System Info - See Your System Specs - Windows 7 Help Forums

    Include PSU. cooler, case, peripherals and anything attached to the computer by wired or wireless (mouse, keyboard, headset, printer, xbox, etc.)


    1) Find a flash drive that you can format ( > or + 8 GB)
    2) Make a bootable Windows 10 iso:
    Download Windows 10
    3) Insert the flash drive into any USB port
    4) Power on the computer and repetitively click the applicable keyboard key to open the BIOS boot menu
    List of PC brands with their corresponding hot-keys
    5) For custom computers open the BIOS menu to temporarily modify the boot order so that the external USB drive is on top.
    6) select external USB hard drive
    It may take 5 - 10 minutes for the Windows iso to load while viewing the Windows icon
    7) Select language, time, currency, keyboard or click next
    8) Look in the left lower corner and click on "repair your computer". (make sure you do not click on install as this is the method to perform a clean install)
    9) Click troubleshoot
    10) Click system restore and start with the oldest date and keep trying more recent dates. (System restore is likely to fail)
    If system restore fails or if there are no restore points move to the next option
    11) Click startup repair (startup repair is likely to fail)
    If startup repair fails move to command prompt
    12) Click command prompt > Administrator: X:\Windows\system32\cmd.exe > X:\Sources>

    Use a camera or smart phone camera to take pictures and post images of the progress/results.
    Some of the command responses may fill the window so take multiple pictures.

    13) type: bcdedit /enum all
    Click enter to see (Firmware Boot Manager, Windows Boot Manager, Windows Boot Loader, Windows Boot Loader, Resume from Hibernate, Windows Memory Tester, EMS settings, Debugger Settings, RAM defects, Global Settings, Boot Loader Settings, Hypervisor Settings, Resume Loader Settings, Device Options)

    14) type: bcdedit | find "osdevice"
    Click enter to see (osdevice partition=C : (this could display D :)

    15) type: diskpart
    16) type: list disk
    17) type: list volume
    Look under the Fs column for a volumes that display NTFS, or FAT32, or RAW and record and/or take a picture
    18) type: exit

    19) type: chkdsk /r C: (Use the drive letter that was displayed for the partition)
    Click enter to see (The type of file system is NTFS, Stage 1: Examining basic file system structure, Stage 2: Examining file name linkage, State 3: Examining security descriptors, Stage 4: Looking for bad clusters in user file data, Stage 5: Looking for bad free clusters) This may take a while to complete)

    20) type: sfc /scannow /offbootdir=G:\ /offwindir=G:\windows (Use the drive letter that was displayed in the partition for each letter G) (When typing this command there is a space between \ /)
    Click enter to see (Beginning system scan. This process will take some time.)

    21) type: bootrec /fixmbr
    Click enter to see (The operation completed successfully)

    22) type: bootrec /fixboot
    Click enter to see (The operation completed successfully)

    23) type: bootrec /scanos
    Click enter to see (Scanning all disks for Windows installations; Please wait, since this may take a while.........Successfully scanned Windows installations. Total identified Windows installations: 0; The operation completed successfully) (This may display 0 or 1)

    24) type: bootrec /rebuildbcd
    Click enter to see (Scanning all disks for Windows installations; Please wait, since this may take a while.........Successfully scanned Windows installations. Total identified Windows installations: 0; The operation completed successfully) (This may display 0 or 1)

    25) type: exit
    26) Click Turn off your PC
    27) Power on
    28) Make a brand new restore point
    29) Make a backup image using Macrium:
    Macrium Software | Macrium Reflect Free
    30) Save the backup image to another drive or to the cloud.
      My ComputerSystem Spec

  3.    18 Jan 2018 #3

    zbook said: View Post
    Please update the computer specs in the "MY Computer" section.
    System Specs - Fill in at Ten Forums:
    System Specs - Fill in at Ten Forums Site Use Tutorials
    In the left corner below in your post you find 'My System Specs'.
    After clicking it you can find a link a little below that says 'Update your System Spec', click on this link to get to the page where you can fill in your system specs.
    System Info - See Your System Specs - Windows 7 Help Forums

    Include PSU. cooler, case, peripherals and anything attached to the computer by wired or wireless (mouse, keyboard, headset, printer, xbox, etc.)


    1) Find a flash drive that you can format ( > or + 8 GB)
    2) Make a bootable Windows 10 iso:
    Download Windows 10
    3) Insert the flash drive into any USB port
    4) Power on the computer and repetitively click the applicable keyboard key to open the BIOS boot menu
    List of PC brands with their corresponding hot-keys
    5) For custom computers open the BIOS menu to temporarily modify the boot order so that the external USB drive is on top.
    6) select external USB hard drive
    It may take 5 - 10 minutes for the Windows iso to load while viewing the Windows icon
    7) Select language, time, currency, keyboard or click next
    8) Look in the left lower corner and click on "repair your computer". (make sure you do not click on install as this is the method to perform a clean install)
    9) Click troubleshoot
    10) Click system restore and start with the oldest date and keep trying more recent dates. (System restore is likely to fail)
    If system restore fails or if there are no restore points move to the next option
    11) Click startup repair (startup repair is likely to fail)
    If startup repair fails move to command prompt
    12) Click command prompt > Administrator: X:\Windows\system32\cmd.exe > X:\Sources>

    Use a camera or smart phone camera to take pictures and post images of the progress/results.
    Some of the command responses may fill the window so take multiple pictures.

    13) type: bcdedit /enum all
    Click enter to see (Firmware Boot Manager, Windows Boot Manager, Windows Boot Loader, Windows Boot Loader, Resume from Hibernate, Windows Memory Tester, EMS settings, Debugger Settings, RAM defects, Global Settings, Boot Loader Settings, Hypervisor Settings, Resume Loader Settings, Device Options)

    14) type: bcdedit | find "osdevice"
    Click enter to see (osdevice partition=C : (this could display D :)

    15) type: diskpart
    16) type: list disk
    17) type: list volume
    Look under the Fs column for a volumes that display NTFS, or FAT32, or RAW and record and/or take a picture
    18) type: exit

    19) type: chkdsk /r C: (Use the drive letter that was displayed for the partition)
    Click enter to see (The type of file system is NTFS, Stage 1: Examining basic file system structure, Stage 2: Examining file name linkage, State 3: Examining security descriptors, Stage 4: Looking for bad clusters in user file data, Stage 5: Looking for bad free clusters) This may take a while to complete)

    20) type: sfc /scannow /offbootdir=G:\ /offwindir=G:\windows (Use the drive letter that was displayed in the partition for each letter G) (When typing this command there is a space between \ /)
    Click enter to see (Beginning system scan. This process will take some time.)

    21) type: bootrec /fixmbr
    Click enter to see (The operation completed successfully)

    22) type: bootrec /fixboot
    Click enter to see (The operation completed successfully)

    23) type: bootrec /scanos
    Click enter to see (Scanning all disks for Windows installations; Please wait, since this may take a while.........Successfully scanned Windows installations. Total identified Windows installations: 0; The operation completed successfully) (This may display 0 or 1)

    24) type: bootrec /rebuildbcd
    Click enter to see (Scanning all disks for Windows installations; Please wait, since this may take a while.........Successfully scanned Windows installations. Total identified Windows installations: 0; The operation completed successfully) (This may display 0 or 1)

    25) type: exit
    26) Click Turn off your PC
    27) Power on
    28) Make a brand new restore point
    29) Make a backup image using Macrium:
    Macrium Software | Macrium Reflect Free
    30) Save the backup image to another drive or to the cloud.
    Thanks for the tips! Yesterday I resetted my pc and reinstalled my basic apps (antivirus, firefox, etc.) everything seemed to be working fine. Today I come back and turn on the pc and I see the same problem... I tried startup repair and system restor (as I made a restore point yesterday) didn't help. I ran the commands and most of them worked except for bootrec /fixboot which ended up with "Access is denied." I took a bunch of photo which I'll upload to imgur or some similar site and post them here.
      My ComputerSystem Spec

  4.    18 Jan 2018 #4

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      My ComputerSystem Spec

  5.    18 Jan 2018 #5

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      My ComputerSystem Spec

  6.    18 Jan 2018 #6

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      My ComputerSystem Spec

  7.    18 Jan 2018 #7

    UPDATE: I've noticed that I made a mistake by not having my path set to X:\Sources> so I did that and redone the commands. bootrec /fixboot worked but still hasn`t fixed the problem. SO I reverted back to an even older restore point and I`m back in my PC. So here's what I think is happening. Let's be honest it definetly is not an app that's causing this, like antivirus or web browser. It's one of the two then: a faulty update (as a few of them were removed during the recent restore) or a faulty driver. I've paused the updates for now. Gonna try updating drivers and seeing if I get the same error. If I don't it's an update.
      My ComputerSystem Spec

  8.    18 Jan 2018 #8

    Now that you can boot into Windows, press the Win key+X and choose Powershell (Admin) here type
    SFC /scannow and press enter. This should replace any missing system files.
    If it says it cannot fix everything, then type
    Dism /Online /Cleanup-Image /RestoreHealth and press enter.
      My ComputerSystem Spec


  9. Posts : 19,920
    windows 10 professional version 1607 build 14393.969 64 bit
       18 Jan 2018 #9

    With you able to boot the computer now please perform the following steps:
    1) create a brand new restore point
    2) backup all files to another drive or to the cloud
    3) create a backup image using macrium:
    Macrium Software | Macrium Reflect Free
    4) place the backup image onto another drive or into the cloud
    5) run this log collector and post a zip into the thread:
    log collector v2-beta08.zip
    6) Open disk management > widen the volume and status columns > make sure that the contents of each row are fully visible and nothing is cut off > post an image into the thread
    Disk Management - How to Post a Screenshot of General Tips Tutorials
    7) download and install mini tool partition wizard > post an image into the thread:
    MiniTool Partition Wizard Free Edition - Free download and software reviews - CNET Download.com
    8) perform an in place upgrade repair:
    Repair Install Windows 10 with an In-place Upgrade Installation Upgrade Tutorials
      My ComputerSystem Spec

  10.    19 Jan 2018 #10

    zablablukas said: View Post
    Hello! I've just tried turning on my PC and it shows me a BSOD saying INACCESSIBLE BOOT DEVICE. Yesterday everything was fine. I turned it off normally like always. I haven't updated any drivers either and there are no external drives or USBs connected. I liked for some solutions but none worked. I tried booting into safe mode (got the same error), I checked if my SATA options werr on AHCI (which they were). What do I do? I don't want to lose all my data!
    When I have seen this message before , it was a Bios Post message not a BSOD and it was because an Update had screwed up the Order of the Boot Devices in the Bios and it was trying to boot off D:\ instead of C:\ when I went into the Bios to check the Boot Order, so I set the 1st device back to Windows Boot Manager and all was Well.

    KB.
      My ComputerSystem Spec


 
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