Plesk won't load; Invalid MySQL Password

[SamH]

Hi,

Since yesterday, for some strange reason, the Plesk panel cannot login to MySQL anymore on my VPS. Everytime i try to start it from Virtuozzo, i get this message:

Operation start fails for service psa.
Can not start/stop/restart service:
===> Reading /etc/psa/psa.conf ...
db_connect: failed to connect to database: Error: Access denied for user: 'admin@localhost' (Using password: YES)
Unable to connect to mysql database
Starting psa-spamassassin service: [FAILED]
ERROR 1045: Access denied for user: 'admin@localhost' (Using password: YES)
ERROR 1045: Access denied for user: 'admin@localhost' (Using password: YES)
db_connect: failed to connect to database: Error: Access denied for user: 'admin@localhost' (Using password: YES)
db_connect: failed to connect to database: Error: Access denied for user: 'admin@localhost' (Using password: YES)
Key register failed
/usr/local/psa/admin/bin/httpsdctl: line 227: 8134 Terminated $HTTPD
/usr/local/psa/admin/bin/httpsdctl start: httpd could not be started
Starting Plesk: [FAILED]

Also, i cannot login to MySQL using my Root Password (using ssh). I tried username's root and admin, both wont work with my password.

Can anyone help?

Thanks in Advance!
Sam.