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Virtual Machines Fail to Start, cannot add disks <failed to add device 'Microsoft Virtual Hard Disk'> <Failed to power on with Error 'General Access Denied Error'>

• Friday, February 13, 2009 8:03 AMJimbo1199

   
  

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  After Windows Updates 12th Feb 2009 machines would not start.
  

  kb958687
  kb961260
  kb948881
  kb960715

  
  "Failed to power on with  Error 'General Access Denied Error'"
  
  If you detach the DISK, you cannot re-attach it
  
  "failed to add device 'Microsoft Virtual Hard Disk'"
  
  Event Log entries
  Source Hyper-V-Worker Event ID 12220
  Source Hyper-V-Worker Event ID 12290
  Source Hyper-V-VMMS   Event ID 14140
  Source Hyper-V-VMMS   Event ID 12140
  Source Hyper-V-VMMS   Event ID 12620
  Source Hyper-V-VMMS   Event ID 12290
  
  
  You are in Deep schtuck.
  
  The solution with some fiddling is as follows
  regedit
  navigate to 
  
  HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E97D-E325-11CE-BFC1-08002BE10318}\Properties
  
  export it
  
  Rightclick Properties, permissions, click through to change permissions you cannot see, click advanced, owner tab and take ownership, ok back to properties, and then click to add a permission, and all will come back.
  
  
  Ok Click out and back to properties, 
  export it again to another file
  in that folder find "Security"
  
  Delete the value
  
  reboot server, re-attach any disks, and hey presto it works.
  
  Many thanks to Microsoft Sydney for their help
  
  This error is associated with Intel Server Managment software as well, I have seen it arounf a bit on S3200SHV and S3000AH boards
  
  Jim Ladd ARRGHH me hearties
  
  

  ---

  Jimbo
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