Within Hyper-V, each VM has an unique ID that is used to assign permissions to the VM’s configuration files and VHD’s.  When you (accidentally) overwrite these permissions, your virtual machines won’t start and you’ll receive the following error:

Hyper-V Manager

[Main Instruction]

An error occurred while attempting to start the selected virtual machine(s).

[Content]

‘EX10-MX03′ failed to start.

Microsoft Emulated IDE Controller (Instance ID {83F8638B-8DCA-4152-9EDA-2CA8B33039B4}): Failed to Power on with Error ‘General access denied error’

IDE/ATAPI Account does not have sufficient privilege to open attachment ‘D:VMEX10-MX03EX10 – MX03.vhd’. Error: ‘General access denied error’

Account does not have sufficient privilege to open attachment ‘D:VMEX10-MX03EX10 – MX03.vhd’. Error: ‘General access denied error’

[Expanded Information]

‘EX10-MX03′ failed to start. (Virtual machine ID 731B17AC-1A2B-40B6-B879-3D35167B11D2)

‘EX10-MX03′ Microsoft Emulated IDE Controller (Instance ID {83F8638B-8DCA-4152-9EDA-2CA8B33039B4}): Failed to

Power on with Error ‘General access denied error’ (0×80070005). (Virtual machine ID 731B17AC-1A2B-40B6-B879-3D35167B11D2)

‘EX10-MX03′: IDE/ATAPI Account does not have sufficient privilege to open attachment ‘D:VMEX10-MX03EX10 – MX03.vhd’. Error: ‘General access denied error’ (0×80070005). (Virtual machine ID 731B17AC-1A2B-40B6-B879-3D35167B11D2)

‘EX10-MX03′:  Account does not have sufficient privilege to open attachment ‘D:VMEX10-MX03EX10 – MX03.vhd’. Error: ‘General access denied error’ (0×80070005). (Virtual machine ID 731B17AC-1A2B-40B6-B879-3D35167B11D2)

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These settings can be reset by re-adding the GUID of the VM to the files that belong to the VM. These files are presented to you in the above error. This is done by following these steps:

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