You can get to server-manager from the console or from a putty session by logging in as root, then running "su admin", then pick option 6 from the menu: "Access server manager". Uses Lynx, and is a little frustrating, but it works.
Have you looked at your log files to see why the website is not responding? I've had similar problems a few times, but only after doing updates or installing contribs. Looking at /var/log/httpd/error_log and /var/log/httpd/admin_error_log usually tell me what the problem is and give me a place to start looking for solutions.