My MacBookPro can no longer connect to airport

Last night I was changing the channel settings on my extreme abse station and express to try and improve signal strength. When completed, my Mac Book Pro was unable to connect to the network or to see the devices in Airport Utility, although all the other computers in the house were able to do so. I tried rebooting it, turning airport on and off on the MacBookPro, etc and it is unable to connect. Any ideas?

This situation becomes more and more inexplicable---- I have an aiport extreme aase station and an airport express used as a WDS remote to increase strength in the house. Both are given the same network name. Both are on the same channel. The airport base station only gives the option of 802.11n. The express is set to 802.11b/g. When I move to another part of the house now, I get kicked off the network and when I go to rejoin, I am asked to put in as password for a WPA network, even though mine is set up with WEP (since we have an old PC, gasp!, connected to it). Obviously I can't connect, because there is no WPA Personal password. I've tried deleting the preference files for Airport and Network COnnect to try and reset them both and the same thing happens. I am totally confused. Is there a problem with using the same network name on both the base station and the extreme?I don't know if it is a problem on the Mac Book Pro, or with the network itself. Any advice would really help.

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http://support.apple.com/kb/ht4259
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Message was edited by: Andifox

Dr Chris:
Thanx for answering my Q of a month ago. As you can see from my post of 18 minutes ago, things have gone from bad to worse under my neglectful eye.
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Point of order:
If I've had an answer - or more than 1- to my question, but I still need to discuss it- should I Check the "Yes my question has been answered" box? I did not, here, because I thought it might result in my further questions dropping off the radar for forum experts. Please advise... \\Butter F

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