To carry out a successful dcpromo under Server Core you will need an answer file. Not all settings shown in the answer file below are needed (DNS server, GC etc)

[DCInstall]
ReplicaOrNewDomain=Replica
ReplicaDomainDNSName=cobranet.com
SiteName=SiteA
InstallDNS=Yes
ConfirmGc=Yes
CreateDNSDelegation=Yes
DNSDelegationUserName=adcobranet\sysadmin
DNSDelegationPassword=*******
UserDomain=cobranet.com
UserName=cobranet.com\stuartconey
Password=*********8
ReplicationSourceDC=dc1.cobranet.com
DatabasePath=”D:\NTDS”
LogPath=”E:\NTDS”
SYSVOLPath=”D:\SYSVOL”
SafeModeAdminPassword=*********

Full MS article here
http://support.microsoft.com/kb/947034

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