For the first time appear this kind of problem is a little bit confused,,

First looked at the state of the apache
Status:
Active: failed (Result: exit - code)
Try to restart the apache site to normal after restart access

The following is the content of the error in the apache logs node:
Can 't initialize threads: error 11
PHP Fatal error: Unable to start the mysql module in Unknown on line 0

This is what problem of PHP or mysql problems or apache problem,,,,