Originally Posted by hvulin
You probably just broke your apache configuration. I don't use centos but I think it shouldn't matter. My debian apache2 has it's config in: /etc/apache2/ directory. Look under sites-enabled/ directory for what is enabled (debian default has 000-default file) or if it doesn't exist look directly in /etc/apache2/httpd.conf or /etc/apache2/apache2.conf.
Line you are looking for is DocumentRoot /var/www (or probably something else now) - it points to web root directory under which you should put your web site. Op5 probably changed this to its own directory so your original website is note showing any more.
If your op5 website is under /usr/op5/www (I don't know the real directory) you could just link it to the real directory (without copying):
ln -s /usr/op5/www /var/www/op5
That doesn't seem to be the problem. Documentroot in httpd.conf is /var/www/html just as it should be.
The problem is that neither of them is working. Not op5s site and not mine