On my main 2008 R2 domain controller:
When I boot, the screen goes black (monitor light goes amber)
RDP logon to the server says "An attempt was made to logon, but the network logon service was not started"
Trying to logon to the local admin account on the domain controller via RDP gives the same problem.
It's a really big mess..
EDIT: After playing around with some remote management tools, it seems neither netlogon nor RPC server are running.. tried starting them but they won't start..