If the original DC is offline you will want to seize the FSMO roles.
See:
Using Ntdsutil.exe to Seize or Transfer FSMO Roles to a Domain Controller
http://support.microsoft.com/default...b;en-us;255504
Flexible Single Master Operation Transfer and Seizure Process
http://support.microsoft.com/default...b;en-us;223787
hth
DDS W 2k MVP MCSE
"Simon Xia" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> windows 2000 mix mode domain. two DCs.
>
> my problem is the first domain controller is totally dead. no way to
> transfer roles and depromo it.
>
> now the second controller is still able to authenticate users and run
> exchange server. i have wins and dns all installed on this BDC.
>
> what i want is to make the BDC the PDC and change to native mode domain.
>
> what steps should I take to make this happen? can i just transfer roles on
> the BDC and ignore the fact that the PDC is dead?
>
> any advise will be greatly appreciated.
>
> Simon
>
>