Flashing/Blinking Airport Status Icon

Hello Everybody
I hope you can help me. After clicking my university's wireless network name and entering the WEP password, the signal icon flashes with five bars before going dead/blinking for a few seconds and then appearing to have no signal - very unusual. I have spent a lot of time trying to fix this with our IT experts with no success. We rebooted the computer on a different HD and the same thing happened which led us to believe it was a problem with the Airport card and not the software. However, when I go on various other wireless networks, I can surf the web with full signal so the card appears to be fine. Obviously, I don't want to send it off to the workshop unless I'm sure it's a hardware problem since I will be charged for diagnostics if they don't find a problem with the card
Thanking you in anticipation of a favorable response to my query,
Jack

I am having a very similar problem. Did you find any fixes for this?
I have a snow base station and have no problems connecting to it with a clamshell iBook running OS X. But with my PowerBook G4, whenever I turn Airport on and try to access the base station, the airport status icon constantly flashes, almost like a pulse.
Today I took my PowerBook to a hot spot, and Airport worked great, so I know that my card is fine.
One thing I'm wondering about -- what firmware are you using on your base station? I currently have 4.0.4, so it's possible that upgrading to 4.0.9 will solve this problem. I'm reluctant for the moment to try the firmware upgrade because the clamshell iBook connects to the snow base station so smoothly. I don't want to mess up one set-up while trying to fix another.
I'll check back in case you have new information, including (I hope) a fix for this.
Steve
PowerBook G4 Mac OS X (10.4.6)

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I am having a very similar problem. Did you find any fixes for this?
I have a snow base station and have no problems connecting to it with a clamshell iBook running OS X. But with my PowerBook G4, whenever I turn Airport on and try to access the base station, the airport status icon constantly flashes, almost like a pulse.
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