Hyper-V DC shows only black screen at Ctrl+Alt+Del screen.

As the title suggests, clients DC (a Hyper-V VM, Windows Server 2008 R2) shows only a black screen after the Ctrl+Alt+Del prompt is flashed up. if I hit Ctrl+Alt+Del the logon background will appear shortly, then black again.

I can't log on by just typing the password.
I can't remote into it.
DHCP and DNS services are down.

I can ping the server.
I can see shared files.

I have tried safe mode.
I have tried last known good configuration.
I have exported the VHDs to a dev server and still black screen.
I have run chkdsk on the HDDs.

Any suggestions? Your help is truly appreciated!
Dougj182Asked:
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Dougj182Author Commented:
Fixed the issue by restoring the registry files from a backup.

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