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Today I was configuring a server with the Hyper-v role and without paying attention I picked the wrong hyper-v generation. When I attached an ISO file to boot from, so I could configure the virtual machine I received this error – “Synthetic SCSI Controller (Instance ID AC2FB770-77F1-4E0C-9E91-C66766022B89): Failed to Power….”
This error came about because of picking Generation 2 during the virtual machine setup.
The way around it is to delete the VHD file and re-create the virtual machine, but make sure you pick Generation 1.