what authentication method are you using ?
check your "config.inc.php" file
Code:
$cfg['Servers'][$i]['auth_type'] = 'http'; // Authentication method (config, http or cookie based)?
$cfg['Servers'][$i]['user'] = ''; // MySQL user
$cfg['Servers'][$i]['password'] = ''; // MySQL password (only needed
// with 'config' auth_type)
if using the config method .. then u need to specify the username/passw there in the file
if using http method then leave it blank
this page: *internetmaster.com/installtutorial/download_myadmin.htm
has good info about setting up phpmyadmin
-----
alibi