# /etc/init.d/mysql start
 * working on 0                 
 * Starting mysqld0 (/etc/mysql/my.cnf) ...
.......... * MySQL NOT started (0)    

# cat mysqld.err 
060113 11:31:02  InnoDB: Started; log sequence number 0 43655
060113 11:31:02 [ERROR] Can't start server : Bind on unix socket: Permission denied
060113 11:31:02 [ERROR] Do you already have another mysqld server running on socket: /var/run/mysqld/mysqld.sock ?
060113 11:31:02 [ERROR] Aborting
                                
060113 11:31:02  InnoDB: Starting shutdown...
060113 11:31:04  InnoDB: Shutdown completed; log sequence number 0 43655
060113 11:31:04 [Note] /usr/sbin/mysqld: Shutdown complete