Solve Hyper-V Error 12700 "Virtual Machine Unable to Start"

Sometimes you are unable to start the Virtual machine while replacing VHD file from existing Virtual hard drive to other drive. This is the most annoying situation when you restrict to start Virtual Machine & see the error pop-up i.e. {General access denied error' (0×80070005)}. If you are facing Hyper-V error 12700 problem then you are at the right place. Read this article and learn how to resolve this error with a manual and professional solution.

IDE/ATAPI Account does not have sufficient privilege to open attachment 'D:\Virtual Server\Virtual Machines\server\system.vhd'. Error: 'General access denied error. This error message indicates that the Hyper-V does not have the enough permissions to open the Virtual hard drive files.

Hyper-V error 12700 dialog box may show because of the following circumstances:

• When the Virtual hard drive (.vhd file) is not correct
• The Security permissions on .vhd file find the SID (ID of Virtual machine) missing, then Virtual machine will not able to start and this may become the reason of Hyper-V general access denied error situation.

Manual Methods to Resolve Hyper-V Error 12700

# Method 1

To resolve general access denied issue in Hyper-V the user has to add the virtual machine SID to the virtual hard disk file ( .vhd)

1. The first step is the user has to note the virtual machine id. That is listed in the “General access denied error.
2. Now in this step, the user has to open the elevated command prompt.
3. In this step, the user has to give the Virtual machine ID (SID) access to the virtual hard disk file. For this, the user has to type the following command.

icacls "Path of virtual hard disk file" /grant "NT VIRTUAL MACHINE\ "Virtual Machine SID number "

4. Press Enter and start the virtual machine. After this virtual machine starts normally.

# Method 2

Please Follow the Instructions Below to Resolve Hyper-V Error 12700

1. The user has to open the Hyper-V manager.
2. After This Right click setting of the virtual machine.
3. Now Find the virtual hard drive option and select “Remove”.
4. Start the Virtual machine again, It should boot successfully.

Expert Solution to Fix Hyper-V Error 12700

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