centos install problem with sql

[bobbio]

Hello,
i`m trying to install ispcp on CentOS 5.1 and everything is going normal before the step:
perl ispcp-setup, when I get this error:

Code:

ERROR: Incorrect SQL Query -> Access denied for user 'root'@'localhost' to database 'db'

or

Code:

ERROR: Unable to connect SQL server

Mysql user, pass, db are correct and mysql user has full privileges to this database, I tried even root user, tried to add full privileges to hole mysql to this user without success. I created simple perl script to to test perl-mysql connection and everything is working fine. How to resolve this, I tried to edit ispcp-setup file, but it didnt went fine
Where could be the problem with this?
Thanks alot.