Help! Can't Connect, DHCP Not Issuing Correct IP Address

I get an vDSL connection and have a home LAN set up with both Ethernet and Airport. Usually, when a computer connects through DHCP, it gets an AP Address of 192.168.0.x, "x" being a number higher than 1, depending on when it connected to the network. My desktop iMac works fine in this regard, with an internal IP address of 192.168.0.5, and the router being 192.168.0.1.
The problem: My Powerbook also used to do this fine, but suddenly this morning it could not connect to the network via Airport or Ethernet, with one or the other turned off, or both turned on.
The key: via Ethernet, the DHCP automatically sets to 10.0.1.4, with the router as 10.0.1.1--which, if I am not mistaken, is the Airport address system. But this is not under "Airport" in the Network control panel, it's under "Ethernet," and thus my problem. I cannot get the danged IP Address to go back to the correct Ethernet address! I tried restarting, turning Airport off, renewing the DHCP license, and trying the assistant features--nothing worked. My Powerbook is completely offline--and I have to use this for my workj in just a few hours!
Help! Thanks!

OK, never mind. It turns out that I had plugged in the ethernet cable to the wrong port on the Airport base station. Somehow that was mucking everything up. I switched the port, and now it works fine.

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http://img96.imageshack.us/img96/1738/screenshot20100424atpm1.png
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Regards,
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I'm having the same problem as this other person is having,
http://discussions.apple.com/thread.jspa?messageID=7072594
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I take the router out of the equation and I can connect just fine, connecting directly through my cable modem.
I know it's not a DNS issue as DNS is not even being used, it's a direct connection to the IP address.
In the thread above, that person couldn't connect to twitter.com and it was blocked for no apparent reason.
I can't connect to this IP address for no apparent reason.
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changing the dhcp -> manual and setting the IP and using 255.255.255.0 as a subnet mask
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setting a static IP address for my computer
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returns corretct disk address for all the files if file system size < 1 TB.and
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Help! Can't Connect, DHCP Not Issuing Correct IP Address

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