Can't connect to the internet! Help!

I finally got my iMac back for it's third repair in two months and I've spent the entire night trying to get it onto the internet via airport. What's surprising is that I am typing this from the same network on a PC. I am beginning to think it's a hardware issue so I went and started a hardware test, the airport was the first thing to pass. I am trying to connect to a Netgear wireless network which is connected to an SBC Yahoo! DSL modem. I was able to connect before I got it repaired but ever since I got it repaired. I am getting really frustrated with this and I would like to be able to connect to the internet on my iMac as I was able to before. If anyone has ANY advice at all, please reply to this because this is an urgent issue.

Hello el:
I think you would get good feedback by posting your question either here:
http://discussions.apple.com/forum.jspa?forumID=755
or here:
http://discussions.apple.com/forum.jspa?forumID=880
People that frequent those forums have a great deal of knowledge about networking issues.
Barry

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