Fedora seems to be connected to the Internet... but it's not.

[Seth]

So, I just installed Fedora 12 onto a current model 15" MacBook Pro, and
it's connected to the local network just fine, but I'm having a little
trouble with the Internet. I can download new applications from the
repositories, so I AM on the Internet, but it appears that the only website
I can visit is Fedora's website. I cleared the cache and tried again and
could still go to fedoraproject.com, but if I try to go to any other
website, Firefox tells me I'm not connected to the Internet. I'm not an
expert at Linux, so I would like to stay away from the command line if at
all possible.

Thanks for any help you can provide.

P.S. I did try entering all the network information manually instead of
using DHCP and still had no luck.
--
Seth
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