PDC Not Recognized After Power Failure

Does your PDC come up successfully and let you log into it?
Do you have a BDC online?
Can any of the other servers, when logged in locally, can they PING the PDC?
Do you use WINS? If so, is WINS running?
There are several things to think about before going to a corrupted SAM. And if the SAM is mangled, then you are gonna need a ERD made before this outage. Do you have one?

Power failures do strange things to networks. Is there an active hub or switch between the server and the rest of the domain? Try resetting (unplugging) the hub/switch for about a minute. That should take care of it. I am assuming that all the otherputers on each of their segments can see each other.
Good luck!

Mike

Did your PDC have a static IP address, does it still have the same network settings, subnet mask, default gateway etc. can the PDC ping other m/c's on the network. If you're using switches and hubs were they powered up after power failure.
Best of luck
JV.

I have had this problem before when the power was out longer than the UPS's could maintain it. My PDC has a lot of services and hardware on it to start, the BDC did not. As a result the BDC would finish booting before the PDC the BDC would then become the PDC except that the PCD was still around causing all kinds of hell.

If this happened usually shutting down the BDC and the PDC and having the PDC fully up before starting the BDC would work. At one point however we had to go into the PDCand syncronize the entire domain from computer manager to get the users to log back on to the server.