Try this...
ping google.com
(do you get 4 replies?)
ping 74.125.237.43
(do you get 4 replies?)
telnet google.com 80
(do you get something like this after hitting enter a few times -
HTTP/1.0 400 Bad Request
Content-Type: text/html; charset=UTF-8
Content-Length: 925
Date: Tue, 21 Feb 2012 22:17:37 GMT
Server: GFE/2.0
<!DOCTYPE html>
<html lang=en>
<meta charset=utf-8>
<meta name=viewport content="initial-scale=1, minimum-scale=1, width=device-w
idth">
<title>Error 400 (Bad Request)!!1</title>
<style>
*{margin:0;padding:0}html,code{font:15px/22px arial,sans-serif}html{
background:#fff;color:#222;padding:15px}body{margin:7% auto 0;max-width:390px;min-height:180px;padding:30px 0 15px}* > body{backgr
ound:url(//www.google.com/images/errors/robot.png) 100% 5px no-repeat;padding-right:205px}p{margin:11px 0 22px;overflow:hidden}ins
{color:#777;text-decoration:none}a img{border:0}@media screen and (max-width:772px){body{background:none;margin-top:0;max-width:no
ne;padding-right:0}}
</style>
<a href=//www.google.com/><img src=//www.google.com/images/errors/logo_sm.gif alt=Google></a>
<p>
<b>400.</b> <ins>ThatÔÇÖs an error.</ins>
<p>Your client has issued a malformed or illegal request. <ins>ThatÔÇÖs all we know.</ins>
Or do you get some kind of error?
Then try this
telnet 74.125.237.43 80
and what happens?
If you can telnet/ping IPs but not DNS names, you have an issue with DNS. If you can't do either, you have something blocking your communication outbound (Proxy/firewall).
Hope that helps!
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