If for any reason you edit the Boot Configuration Data be sure to run the following command after the edit:
bcdedit /set hypervisorlaunchtype auto
If you don’t do it you will run into an error saying that your SQL Server virtual machine could not be started because the hypervisor is not running and then you will be presented with three possible errors, usually the main cause is where changes have been made to the Boot Configuration Data or BCD. This can also happen if you had sysprep'ed images with Hyper-V.
Ing. Eduardo Castro Martínez, PhD – Microsoft SQL Server MVP
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