Airport Express not connecting to the internet via cable modem

Hi. I need help. I just bought an airport express to get wireless internet and airtunes. I connected everything and ran the airport utility. Everything is good, so it says. I can play music through my stereo using airtunes, but when I try to get on the internet I get nothing. My macbook recognizes the network, but I can't load any pages. I've tried unhooking the ethernet from the express and unplugging the power from my modem, then plugging my modem back after about 30 seconds, then reconnecting the ethernet to the airport after another 30 seconds but still, nothing.
Does anyone know what I'm doing incorrectly? When I connect my macbook directly to the modem via ethernet I'm on the internet just fine. Thanks!!!!

Do you have the Express setup to distribute IP addresses?
If you do, you might turn it off in the Airport Utility.
Also check you IP address on your MacBook.
Make sure it is not self-assigned or something different than what your provider (cable modem) usually assigns you...
   Joseph Kriz

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