freebsd 10.1 mysql無法啟動...不論是裝5.0、5.5、5.6都無法啟動...要更改root密碼會出現如下訊息...煩請高手解惑......

mysqladmin: connect to server at 'localhost' failed
error: 'Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)'
Check that mysqld is running and that the socket: '/tmp/mysql.sock' exists!