802.11n 5GHz no longer works on one Macbook

Good evening,
Our household has two Macs connected to an Airport Extreme 802.11n (July 2007), both are MacBooks (Late 2006). For well over a year, both have happily connected to the AE using 802.11n 5GHz. A few weeks ago, however, my wife's Macbook stopped connecting. I've tried a number of things (reconfiguring, restarts, reinstalling the last combo updates, etc.) and the only thing that appears to work is dropping the AE to 2.4GHz (I still keep it at 802.11n-only). My Macbook continues to be able to connect just fine at 5GHz, when I enable that on the AE.
Considering that this drops our available bandwidth from 300Mbps to 130Mbps, I'm not a happy camper, but I'm also tapped out of ideas. I can only guess that there's a hardware malfunction on my wife's Macbook. Her Applecare doesn't expire until 2010, so I may just take it in ...
Any ideas? One note: my wife is still clinging to Tiger, while I'm on Leopard ... in case that matters.
Thanks,
Brice

Not that I can tell. Suspiciously, we did run a salvo of updates from Software Update and the problems started immediately after, but none of those appeared to be directly related to Airport functionality (firmware or otherwise). Just to be sure, I took the "safe" steps of repairing permissions, re-downloading the last combo update & re-applying it. I also searched for any firmware updates related to Airport. What's odd to me is that the firmware reported on her machine is different than that on mine. They're both Late 2006 Macbook models, so that strikes me as odd (but maybe it isn't). I wasn't able to find any updates that her Macbook was lacking, however.
My (working) firmware is: [type] AirPort Extreme (0x168C, 0x87), [version] 1.4.8.0
Her (not-working) firmware is: [type] AirPort Extreme (0x168C, 0x87), [version] 1.4.4
Based on the card type, it doesn't appear that they're different chipsets, so I'm not at all clear on why the firmware versions differ. Was there a firmware update for Leopard that wasn't available/needed for Tiger?
Also, I know for sure that there were no firmware updates performed during the last set of updates ... that's a more involved process, if I recall, not handled through the standard updater, I think.
Thanks for the response!

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Posted: Sep 21, 2008 2:50 AM Reply Email
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Message was edited by: Adrian Crook

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