hi every body

some daye ago i had to change my host so i back up my Db with mysql dumper
and now i import it with mysqldumper but now all of my data is well expect my admin panel
i insert my admin info but it did not enter to site just come back to .admincp/index.php
plz say me what to do?
--------------- Added [DATE]1199643359[/DATE] at [TIME]1199643359[/TIME] ---------------
plz some one help