MacBook Airport card has lost its IP address and won't connect to my network

The Airport card on my MacBook has lost its IP address and will not connect to my network. It worked fine until about two or three days ago. Network Diagnostics says that the Airport now has a self-assigned IP number and will not connect to the Internet. I can't find any info anywhere that tells me how to restore the IP number, and I don't get how it can have a self-assigned number and not connect. I have AT&T U-Verse, and my iMac desktop and two iPhone 4s connect with little difficulty. The MacBook is three years old, and AppleCare just expired two months ago. I'm still running 10.6.8 on both machines. I found an article saying that sometimes DHCP leases expire, but my desktop still works ifne, and I've had both connected to the same network since the same time. The artcicle said that more than one machine can share an IP address, so I wanted to try to enter the desktop IP address into the laptop, but I can't find a way to do so, either. Any thoughts?

Have you tried making a New Location for each yet? The Automatic one get confused easily.
Some "nix" to try when it happens also...
sudo ipconfig set en1 BOOTP;sudo ipconfig set en1 DHCP
sudo ifconfig en1 down;sudo ifconfig en1 up
Sometimes having an all OFF Location can help, thanks to Gnarlodious...
http://gnarlodious.com/Computer/MacOsx/WiFi

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