IMac not connecting to the internet.

Hi, over the past month or so my iMac has been disconnecting and reconnecting to the internet, but today it just doesnt connect at all. At first I thought it was my router so I went to reset it, but nothing changed. So I checked my ipod and the internet worked fine so now I thought it was my the actual airport connector in my compuer that had broken, so in a last resort I went to my windows bootcamp partition to see if it worked. And of course it works fine that's what im on now. So now I know its software based. What's going on? someone help.

See if anything in this article applies to you.
http://reviews.cnet.com/8301-13727_7-20050793-263.html?part=rss&tag=feed&subj=Ma cFixIt
Since it deals with the firewall I suppose a quick check might be to turn the firewall off and see.
Regards

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Which OS are you using (update your user profile).Try a
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http://support.apple.com/kb/HT3964
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You are not connected to the internet error

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The rule is, your Mac will try to send packets bound for the Internet to the Topmost Interface on
System Preference > Network
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IMac not connecting to the internet.

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