Last night I had a VM that didn't backup. This morning when I investigated it I could not ping the VM. I logged into the VM via the host's VM Manager and all looked well with the exception of it not seeing any computers on the domain. I rebooted the VM and after a few minutes it still said "stopping" in the VM Manager even though the VM said it was turned off and needed to be started. Of course, start was not an available option. I did some googling and ran across this article for killing the hung VM (http://community.spiceworks.com/how_to/show/528-killing-ending-a-hyper-v-virtual-machine-that-is-stuck
) ... I downloaded the reference Process Explorer program and killed the process for the hung VM and it did go to the "Off" mode; however, start was still not an option. I restarted the three Hyper-V services and now when I try to launch VM Manager I get "connecting to virtual machine management service" and after about a minute get "you might not have permission to perform this task" ... I know if I reboot the host it will probably clear this up, but I would like to find a way get the VM Manager to load so I can see all the VMs and hopefully start the down VM and avoid taking the other ten VMs down with it. The host is running W2008 R2 SP1.