Help Configuring Apache

My apache webserver just stopped working one day. And so after uninstalling
and reinstalling apache 2.0 - I got it to run, however I can't seem to make
it work with my domain. I edited the httpd conf file but I'm not sure what
I'm doing wrong. I can access my webserver by ip address but not by the
domain. Is there a configuration I'm missing somewhere? Please help.
Thank you.