I have a NT 4 Server with sp4. It was a PDC but it demoted itself to BDC. No one touched the server(according to my co-worker) Now, when I tried to promote BDC to PDC, it showed "no PDC found" Is it possible to promote BDC without PDC? Can PDC demotes itself to BDC? Because it is just something I can not believe it could happen. Can anyone help me..?