Problems setting up web server in CentOS

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http://unix.stackexchange.com – I want to set up a web server on one of my computers (Dell Desktop) and decided on CentOS as the OS. Apache is installed properly (I think. pgrep httpd returns a bunch of processes that are running). I also think that my httpd.conf file is ok (I've read about 4 tutorials on apache setup). My ISP is comcast. I have httpd listening on both port 80 and 8080. But it's not working and I can't figure out why. I had a friend try to see my test.html page (which is in /var/www/html/ - where it's supposed to be.) and he got http error 504, which seems to relate to a proxy or firewall, neither of which (HowTos)