A required device isn’t connected

Microsoft recently released Dynamics AX 2012 R2 Solution Demo Package V4, i.e. a new version of the virtual machine with Dynamics AX and related components installed and configured. The version of AX there is 2012 R2 CU7.

I successfully downloaded, unpacked and imported VM A (30 GB), but when I tried to boot it, I got the following error:

0xc000000e A required device isn’t connected or can’t be accessed

I tried few changes in settings and even different versions of Hyper-V to no avail. Finally I tried to fix the master boot record and other boot data – and that helped!

Here are the instructions:

  1. Mount a Windows Server 2012 installation disc or a disc image (in VM settings). Ensure yourself that CD is the first boot device (section BIOS in Settings).
  2. Start the VM and confirm the boot from CD.
  3. Select/confirm a language, keyboard layout and so on.
  4. Don’t click Install now – choose Repair your computer instead.
  5. Click Troubleshoot and than Command Prompt
  6. Call these commands:
    bootrec /fixmbr
    bootrec /fixboot
    bootrec /rebuildbcd
  7. Confirm the Window installation to be added to boot.
  8. Reboot the VM and let it boot from disk.


  1. This worked for me. when i mounted the virtual disk to another vm and brought it back it to its original vm it gave me this error. thank you so much. i thought i was going to have to restore from a snapshot!

  2. Grazie, Grazie, Grazie!

    You saved my week-end!

    J reboot a Windows 2012 server foundation and don’t works. With starter cd and you support now it works.

    Thank you

  3. Wow, thank you! I’ve been struggling with a Server 2012 R2 installation that failed on me… couldn’t restore from my backup (TBD why). Was able to convert the backup’s VHDX file to a WIM and get that written to the drive with DISM, but it still wouldn’t boot. Somehow stumbled across this post and tried the commands above, and it’s working now!

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