This question has been partially addressed on this site and on the internet, as well as Microsoft support, right here:
My problem is that, after logging into Safe Mode (with a blank screen and only a blinking cursor...) my screen stays black.
The box in question is the DC also running DNS, DHCP. The services seem to be running over the network, and the machine is pingable and all shared folders and files are still accessible.
What do I do to get my display back?