Like Greg said, is it loading the browser and just not connecting or does the browser fail to load? If it loads the browser, is the router supplying it with an IP address? Make sure you do not have a bad Ethernet cable. Look under network connections and status, look at your ip address. Should start with 192,172 or 10 if not that's the problem. Push the Renew button (in your network connections page) make sure it gets an IP address.
