Airport - Self Assigned IP Addess and no Connectivity

I have been having trouble connecting to wireless.  It had been working fine for quite some time (years) and stopped connecting yesterday, although the PCs in our house connect just fine.
In trying to diagnose the issues, I noticed the Airpot connectin says that the IP address is self-assigned and will not be able to connect to the internet.  Any ideas?  I tried deleting the Airport connection and re-added it, as well as deleting the System Configuration files in the Preference files (suggestions I saw in other discussions) but neither worked.  Please help.
Thanks,
Amber

AmberfromEaston wrote:
I noticed the Airpot connectin says that the IP address is self-assigned and will not be able to connect to the internet.
That only means AirPort could not lease an IP from the router. There's nothing to say why it couldn't. The problem may be with the Mac, or it may be with the router. As a first approach, try re-starting the router.

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