If a restored Hyper-V VM is not starting, try re-importing the virtual machine, re-attach the switch, verify file permissions ...
When an unexpected problem occurs in a Windows environment, the first step in resolving that problem is usually to gather information. After all, you need to know what happened before you can fix it.
Hyper-V access denied errors usually stem from insufficient permissions or retained NTFS permissions after VM migration. VM state change errors often indicate corruption, hypervisor conflicts, or ...