mysql : cannot login with other users than root

[george roman]

hi, i have some troubles with my mysql-server. i cannot login with other 
users than root. this is the error

camin9:/home/george# mysql -u dan -p
Enter password:
ERROR 1045: Access denied for user: '[EMAIL PROTECTED]' (Using password: YES)
i've try to add this user with phpMyAdmin and also from command line 
from mysql.

with the root user i connect with success and i can make anny command.
i gues the problem resides on a file permision for reading or somethinf. 
but at the moment i do not know where should i look

please help.
PS this is the only normal user i have on my server.
i use debian woody
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