I restarted one of our DCs this evening after some updates and it decided to stick for about 5 mins on "Active Directory Starting.." during the startup procedure.
It eventually sorted it's self out and gave me the login screen and I don't see any adverse affects(?!).
In the event log, I have a weird event from DHCP:
The DHCP service failed to see a directory server for authorization.
Can anybody shed any light on a reason? Maybe someone has seen it before?