Lost IP address

Today for the first time ever my MBP lost internet connection. I thought it was the modem or the router so I restarted both. I've had to do this before no big deal. After everything restarted I checked the network settings and it won't connect. Digging deeper it seems that the IP address is gone. I've tried to setup another connection and every time it says that the passwords are incorrect and it can't connect. I don't know what to do. Everything works fine when I connect the laptop to the network with a cable. There is also a PC laptop that is working just fine through the wireless router. It's weird that it was working one minute and not the next.
What am I missing?

Mid 2010 MBP 10.6.4 and Linksys WRT120N
Same issues, router worked fine for 6 months then stuck on self-assigned IP, only my macbook, only my network. All other macs/laptops/desktops/smartphones/PCs connect fine.
This among a ton of other issues with this crapbook, every web browser (Safari, Chrome, Firefox, Opera, Camino) crashes, kernel panics, already had a hard drive replaced, charger stopped working... nightmare.
I've read and tried everything in these threads, still nothing.
https://discussions.apple.com/search.jspa?resultTypes=&dateRange=all&peopleEnabl ed=true&q=self+assigned+ip*&containerType=14&container=2104&containerName=Mac+O S +X+v10.6+Snow+Leopard&username=&rankBy=relevance&numResults=30

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