Internet works on other computers, not mine...

Okay, so. We had been having some internet problems last week, but after resetting the modem, and temporary outage in our area, it went back up. However, I'm finding that although all the other computers in the house are able to connect to the internet, my Macbook can't.
My mother's eMac is connected to the same network as mine, and the internet runs fine on it, a bit slow because of the computer, but all the same it works. On my computer, the airport icon in the menu bar shows a full signal strength, but I'm not able to access even Google. Network Diagnostics says that it appears to be working, but it can't connect to the internet.
This really confuses me. Why is the eMac able to connect to the internet on the same network, but the Macbook can't? I would download a system update, but that requires...the internet. The worst thing about it is that my Macbook has always worked on the network until that day.
Please save my computer -- summer vacation's just around the corner, and I can't survive without it! TT_TT
~~Angela

Are you connecting the AirPort Extreme to a simple modem (it will only have one ethernet port), or is the device a gateway (combination modem/router with 3-4 ethernet ports)?

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