Database connection problem

I had xibo CMS running on linux and today when I wanted to open the interface through the browser, it showed me the message:
database connection problem

I opened settings.php and connected to the mysql database with that data without problems.

What CMS version are we talking about here?

Perhaps try to restart your web server and try again to access your CMS in browser?

version is 1.7.6
I already tried to restart apache2 and mysql server. It keeps showing me "database connection problem"
I’m trying to see the mysql log and I think it doesn’t show nothing, but I’m not sure, I’m kind of newbie in linux

If I try to open:
http://hostip/xibo2/maintenance.php
then it shows the message:
Database connection problem. could not find driver

Solved.
I reinstalled php5-mysql package and restarted apache2 server and now it works.

Great, I’m glad it’s fixed.