Depends on how it's meant to be started.
First of all, did you check the log-files?
They should live in /var/log
From my memory of RH I'd suggest to have
a look in /etc/xinetd.d/
Is there an apache-file there?
If you edit it, does it say it should
Another thing to check is /etc/services -
is port 80 open?
But these are all wild guesses, the logs
would help ;)