ERROR: Wi-Fi has the self-assigned IP address

I'm having an issue with both my MacBook Pros at my home.  If I try to connect to the Time Capsule after coming home from work, I receive the exclamation point in my wifi status icon and this error message in my network preferences pane:
"Wi-Fi has the self-assigned IP address 169.254.121.202 and will not be able to connect to the Internet."
The IP address is always different, but it always gives me a subnet mask of 255.255.0.0 and no Router IP.
This problem only seems to occur when both Macs are connecting and not connecting to the Time Capsule wifi.  That is, when my girlfriend is out of town with her MBP gone, I never seem to have the issue.
It also seems like the first of our two to connect is the "winner" and will connect just fine, but the second one will not.  If both computers are open and waiting to connect while we power cycle the Time Capsule, it will connect without any problem.  If I then leave for work, come back home, try to connect, we have to start the same song and dance all over again.
I've tried just renewing the IP.  I've tried restoring the factory settings on the Time Capsule.
I have a sneaking suspicion this may have something to do with the problem: My MBP is a 3rd generation copy of the data from hers.  Hers was once my MBP, but we copied everything from it to a new MBP, which later was copied to a third MBP (the one I'm using now).
Thanks for any help anyone can provide!
Lou

I have a sneaking suspicion this may have something to do with the problem: My MBP is a 3rd generation copy of the data from hers.  Hers was once my MBP, but we copied everything from it to a new MBP, which later was copied to a third MBP (the one I'm using now).
Thanks for any help anyone can provide!
Lou
That is interesting idea.. although the MAC address will be different I wonder if something in the GUID of the install being identical could cause issues..
Do both laptops have the same wireless cards?? Different models came with different cards. .these can not cooperate very well.. although I have seldom heard of them fighting in quite that way.
If you want to take the trouble.. a replacement hard drive and a new install of the OS.. see if it still happens.. how hard do you want to pursue it.
Check the log in the TC for when you try to connect.. and see if there is a reason given for not accepting you. Did you change the laptop network name.. ie they don't both have the same name do they.. it would not work if that was the case.

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