Macbook connected to network but no internet

Hello,
I am having a very strange and concerning internet issue with the Macbook in my household. It can't access the internet even when connected to a wireless network. I know this is not a network issue because a Macbook pro, iphone, and ipod touch all connect to my network at home and can access the internet just fine. Also, the Macbook was unable to access the internet when connected to the school network while my iphone and other computers could.
The problem started suddenly last Monday. Prior to that the internet had been working both at home and at school. It appears to be connect to the network because there are full airport bars and a check mark next to the network (in both locations) but it can't find the airport in the Airport Utility (while at home since the school doesn't use airport). Additionally, it wouldn't connect to the internet directly through the ethernet port either when I plugged it directly into the cable modem.
In the System preferences it has a Self Assigned IP. The preferences are the same as they were when it was working and nothing looks wrong. On Thursday I tried the fix someone posted on this forum of deleting the network from the preferred networks and then adding it again and it worked at home for a day but it still wouldn't work at school and yesterday it stopped working again at home. When I tried to the fix again it didn't work. Also, I've tried repairing permissions twice and that hasn't done any good either. Additionally, it happens under both users on the computer and the test user I created.
Any help would be appreciated.
Message was edited by: witchkitten

Sorry, wrong macbook. This is one of the aluminum one. Reposted in the correct topic.

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