Well can you ping your router? Usualy something like 192.168.1.1. If not then you do not have a connection. Can you ping
www.google.com? If not can you ping 64.233.167.104? If you can ping 64.233.167.104 but not
www.google.com then you have a problem with your DNS server. If you can ping
www.google.com then you have a problem with your browser. Lt me know if any of this helps.
Good luck,
James Glenn