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Boot problem / Missing BCD store

Nox_MD -  
 Anonymous user -
Hello,

I recently got a new computer running on 8.1. About a week ago, it started going haywire and showing all sorts of errors (performance loss, unresponsive programs, etc.). I think it's due to my hard drive since the performance monitor was constantly showing activity stuck at 100% (my research hasn't yet helped me determine if it's a software or hardware issue)... anyway, that's not the most urgent problem.
A few days ago, I ran into a lot of trouble until the computer started trying to launch the repair tool at every startup (unsuccessfully) and took me to the interface of said repair tool without letting me access Windows. Not wanting to do a factory reset right away (I need to back up an extremely important file that I hadn't had the chance to transfer to my external drive) and having no CD or restore point for a restore (pre-installed OS), I managed to restart normally by going into the command console and modifying the BCD store to set the displaybootmenu to true and the bootmenupolicy to legacy so I could access safe mode more easily, shut down the computer properly, and restart as if nothing had happened.
A few days passed where I continued searching to resolve my hard drive issue, but at least the computer was on.
However, recently it crashed again, and I had to force it off via the power button, and I fell back into the same troubles as before, except now when I press F8 in the boot menu, it no longer takes me to the startup options menu where I can choose safe mode. So I tried checking the status of bcdedit via the console to see if the bootmenupolicy field was still set to legacy, but when I try to open it, I get the message: "Unable to open the Boot Configuration Data store. The requested system device cannot be found."
I made myself an administrator using net user administrator /active:yes just in case that was the issue, but no, the store is indeed missing.

My question is as follows: how can I rebuild the BCD store or is there another method to restart Windows just once, enough to back up that file before resetting everything?

Thank you in advance for the help.

PS: I'm currently looking in the BIOS and I see that the "Launch CSM" option is disabled while the "Secure Boot Control" option under Security > Secure Boot Menu is active, whereas several sites on the internet seem to recommend the reverse combination. I just want to know what these two options command before touching them. Thank you.

2 answers

  1.
    le druide Posted messages 40644 Registration date   Status Contributor Last intervention   6 616
     
    Hi,

    You will need a bootable support to repair BCD.

    If I'm not mistaken... If Secure Boot is disabled and Launch CSM is enabled, it allows detecting hardware devices that do not have a boot partition recognized by EFI.

    --
    the druid without the potion.
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    1. Nox_MD
       
      Ok thanks. So I need to find an official version of Windows online, and especially the right version? How do I find out which version I’m running? The console indicates 6.3.9600, so I know I’m on 8.1 but I don’t know if I have update 1 or what... And also, where can I find a suitable version that’s not from a dangerous source?
      As for CSM, etc., I found somewhere that it serves to simulate the BIOS. As for secure boot, it’s just to prevent bootkits. So neither of these will be of any use to me here... unfortunately.
      0
  2. Anonymous user
     
    Hi,

    Can you still access the command prompt? Apparently, the answer is yes. In that case, let's take stock of the situation: 
    diskpart
    list disk
    list volume
    select disk 0
    list partition
    exit

    First photo on www.cjoint.com. Then 
    bcdedit /v

    Second photo on cjoint.

    P.S. What the druid says is not as inaccurate as you think. On certain motherboards (especially Asus), you need to enable the CSM option to benefit from boot options on external media in UEFI. It's strange, but that's how it is.
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    1. Nox_MD
       
      Hi,

      here's the photo taken for everything related to the diskpart tool:

      http://www.cjoint.com/15mi/EEFqlfwnXWY.htm

      I had already done this before and at that time it also showed me the X: (never the C: drive with the OS and its D: partition) but now it seems to have disappeared too, leaving only the disk drive.

      As for the BCD store, as I mentioned in my first message, it is not found and the command bcdedit /v returns the following message: 
      Unable to open the boot configuration data store. The requested system device cannot be found.


      Moreover, in order to eventually rebuild it, I tried to use the tool provided by Microsoft to create a bootable USB drive but it constantly hangs after the "configuration" step at 0% (at first I thought it was downloading the 8.1 image and that it would progress when it was done, but actually, no).
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    2. Anonymous user
       
      No hard drive detected. Either it is disconnected or it is faulty.
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    3. Nox_MD
       
      Yes, that's what I feared.
      Well, there's no need to do a factory reset as advised by materiel.net.
      In any case, it's great for equipment that's only 10 days old.
      0
    4. Anonymous user
       
      Check the connections. Try another SATA port.
      0
    5. Nox_MD
       
      There is no seal that I risk breaking, which would cause me to lose my warranty?
      I had indeed considered opening it but was afraid of finding a dead hard drive and that the seller wouldn't take it back because I had opened it.
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