What should I do if I'm unable to access my server as root?

Question

What should I do if I'm unable to access my server as root?

Answer

If you do not have any root access to your server, you will need to contact your hosting provider or data center for assistance with regaining root access to your server. 

The following article should be helpful with identifying your hosting provider if you're not certain who they are:

How do I identify my hosting provider?