VBoxManage controlvm ChrisVM poweroff
You can now restart the guest and it will be as if you turned the machine on from a powered off state.
Published July 14th, 2011
If your Windows guest VM gets stuck in a state when you can no longer enter commands (such as a bluescreen of death, or the shutting down process) then you can perform the equivalent of pulling the power cord to shut down the VM.
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