[support] Can't login into site

I hope someone can help me with this problem because I am not sure where to look and if its a server things or a Drupal thing.

I cannot login into Drupal with any user. If I try and login the site does nothing but reload. It does not even give an error message.

I got this error message once " "*PDOException*: SQLSTATE[HY000] [2002] Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) in *lock_may_be_available()* (line *167* of*/opt/ee/hub.ee.com/includes/lock.inchttp://hub.ellerslie.com/includes/lock.inc *)."

I have emptied the sessions table and everything looks good.

Any help is appreciated.

Thanks, Steve