PHPMyadmin error

[quannv]

I install ISPconfig 3.0.12 in debian Lenny ( perfect setup).
Everything still is working fine but today I can not log to PHPMyadmin because I get error following.

Welcome to phpMyAdmin 2.11.8.1deb5

phpMyAdmin tried to connect to the MySQL server, and the server rejected the connection. You should check the host, username and password in your configuration and make sure that they correspond to the information given by the administrator of the MySQL server.
Error

MySQL said: Documentation
#1045 - Access denied for user 'root'@'localhost' (using password: NO)

How do I fix this problem

[falko]

Are you sure that you're using the correct password?