IMac connects to network, won't connect to Internet

My 27" iMac connects to our wifi network fine but cannot connect to the Internet. A tweet or e-mail will every once in a while bust through, but Web pages don't load at all.
A MacBook Pro in the same room connects to the same network and the Internet just fine.
This just suddenly happened today.
I've restarted a couple times and run Applejack but nothing helps. I've also flushed the DNS cache.
Any suggestions?

wondering if you've found a solution? my brand new iMac seemed to work for a few hours, and now, not.
I opened the box on the new iMac, and updated software, uploaded some programs (skype, dropbox, firefox). Everything seemed to be working fine.
Then i added firefox sync.
is it a coinicidence that now  i have connection problems?
skype connects and drops, connects and drops
efforts to load web pages are successful and then fail.
the ipad also semed to be failing, suggesting a problem with my router.
wired browsing was working fine.
Came home, and added firefox sync to home mac.
Now i cant use firefox without powerbook dropping internet.
However, at home i am on safari without a problem.

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