Active Directory 5721 5723 5805 PDC Failure dcpromo force removal

In Knowledge Base Blog by angeladmin

If the other server crashed unrecoverably, you will have to seize (you can’t transfer it anymore) the role from a surviving DC.
Check here on how it’s done:
Using Ntdsutil.exe to transfer or seize FSMO roles to a domain controller
http://support.microsoft.com/?kbid=255504

After that, clean out your AD from the leftovers of the dead DC:
How to remove data in Active Directory after an unsuccessful domain controller demotion
http://support.microsoft.com/?kbid=216498

Directory services restore mode dcpromo /forceremoval

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