Unable to log into plesk error 2002

hey,

Can anyone advise on how to solve the issue. The server had a power cut and now when I try log into plesk I get the following:

ERROR: PleskDBException: Unable to connect to database: mysql_connect(): Connection refused /var/lib/mysql/mysql.sock (Error code: 2002). Please check that database server is started and accessible. (Abstract.php:69)

Any ideas?

Cheers