After 2003 DC demotion, I cannot login to demoted server

my plan migrate my old physical 2003 ad dc server on 5 yrs old , not hardware supported new virtual win2k8 r2 ad dc.  physical 2003 server running dns, file , print services , running global catalog server.  since p v not supported, built new virtual win2k8 r2 server, patched it, , promoted dc following microsoft's migration instruction worksheets. verified replicating , looking good.
after a few weeks of planning got point needed rename servers , swap ip addresses. renamed old 2003 server , gave different name , ip address, , rebooted. new 2008 server then modified same name , ip old server, rebooted. ok.. looked good.

i let go week , decided time demote old physical win2k3 server allow win2k8 r2 dc take over. (i forgot mention fsmo roles are on dc not being modified @ all) i demoted old 2003 dc , completed successfully. required reboot, which i instructed do. (i performed demotion desktop using rdp.) walked down console , noticed that the console still had locked screen saver domain admin account. thought, hmmm strange because told server reboot, , rdp session ended rebooting, console should not have anything/anyone still logged in after reboot.  ok, put in password and it unlocked , got in.. decided should reboot again in case didn't reboot. after system came up, cannot log in, remotely or @ console. other strange thing not have ability login locally. pull down list on login screen not have machine name itself, our two domains.  also, can map drive fine , access files on server, cannot login using of accounts tried.(priv or non prived) i've tried rebooting several times login attemps tell me username or passwords not correct.

is there way break in server if can c drive?

roy,

well, goes, since had of data needed, task fell down in priority , have not found cycles it. powered down server.  appreciate assistance provided, but at time, i'm moving on to next puzzle.  again. 

Windows Server  >  Security