10.5.5 airport unable to connect to school network

I have a santa roza macbook Pro, and I am now unable to connect to my schools wireless internet. I'm pretty sure this happened after the 10.5.5 update.
Before I was surprised at how solid the connection was; always full connection, no drop out's ever, reconnected in less then 2 seconds after sleep mode, and everything was working great!
Now I am simply unable to find the internet; airport doesn't connect automaticaly, and clicking on the airport menu just says "no networks found" or something like that.
I'm pretty sure my school has a linksys router, but I'm unsure of what model it is… Also, before this update I used to be able to connect to my neighboors wifi, now Airport (usually) can't find that either.
any ideas?

I read a few other threads about internet problems which mentioned resetting PRAM, removing the internets from the auto connect list in system preferences, and repairing permissions. I did everything, NONE OF IT WORKED.
I'm starting to get mad at apple now… what have they done to airport? It worked so beautifully in tiger…

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No more ideas.....Kevin
Attachments:
error.PNG ‏12 KB
clone_error.PNG ‏30 KB

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Message Edited by darkcraft on 13-Jul-2009 09:47 PM

tomasvaril wrote:
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I have updated information:
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This morning I connected to my wireless network (DSL 2WIRE modem/router) with no problem. This afternoon I returned and Airport refused to connect, giving me the error message, “Airport is unable to connect to the wireless network…” The network shows up as being available, but when I attempt to connect, it wont. (I didn’t make any changes or install any programs this morning).
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[1] Restarted the router
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Other tidbits of information:
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Some more info (in case anyone is listening...)
I tried turning off the WEP code and could connect. (Since I share files on my home network, this isn't a "solution").
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. Switching to WPA from WPA2
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Well, I downloaded Pacifist and the 10.4.11 Combo Update. Pacifist verified the AppleAirPort and AppleAirPort2 .kexts on my drive as matching the ones in the package, but I forcibly reinstalled them anyway and rebooted. Still no luck -- now the network is back to the four-bars-no-bars death loop without even popping up the error dialog.
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I'll paraphrase it here for anyone else who has this problem:
Download the Airport Extreme client software version 2007-004
from http://tinyurl.com/yw3dnu.
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Delete /system/library/extensions/io80211family.kext
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extract and direct it to extract the file to the
/system/library/extensions/ folder
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Hi,
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