Some things to check:
1) Is apache running?
netstat -nl
2) Do you have any firewall rules in place that could be blocking port 80?
iptables -L
3) How are you accessing the server with the ip address with another computer on your local network?
http://192.168.1.1
4) Can you access it from the server itself using the loopback address:
http://127.0.0.1
5) How are you conencted to the internet? Do you have the public ip address or do you have a router with a public IP?
