I am sorry to hear your Internet isn't working, however you really haven't given anyone here enough details to be able to help you.
How do you connect to the Internet? (Wireless/Wired)
Is there a router between you and the Internet, or are you directly connected to the modem? (if you are using wireless, it's probably a router)
When you look at the Network Preference Pane, does it say if you are connected? If you are connected, what is the IP address that you have?
Message was edited by: Noah Robbin