Remove Domain Controller If It Is Shutdown Forever

Work Flow
Call ntdsutil whatever in cmd or run.

c:\ntdsutil.exe

Follow the below procedure.

netdsutil: connections
netdsutil: connect to server %s
netdsutil: quit
netdsutil: select operation target
netdsutil: list domains
netdsutil: select domain %d
netdsutil: list servers in site
netdsutil: select server %d
netdsutil: quit
netdsutil: remove selected server