MacBook Pro can't see Airport network but three other macs in house can

Very strange. I can connect my three iMacs (G3, G5 PowerPC and G5 Intel) to my Airport Extreme Network, but my MacBook Pro can no longer see the Network, and Airport utility (from MacBook Pro) cannot see the Airport base station (although other macs' Airport Utility can no problem). My MacBook pro can see 4 other networks (my neighbours' networks). Doesn't seem to be a problem with my MacBook Pro airport card as I can connect to the (non-Mac) wireless network at work with no problem. Am really confused (not the first time)!
Installed the latest Airport Extreme firmware last week, which was the start of the problem, as I then lost the ability to connect to my Virgin Media Broadband digital TV box, necessitating Virgin engineer visiting at weekend to connect a cable modem to the cable tv box, to which the Airport Extreme station is now attached. Had problems connecting my MacBook Pro last night, but eventually managed it. All other macs connect seamlessly. Am stumped.

I'm troubleshooting a friend's MacBook (Model ID: MacBook4,1) that is having serious Airport problems. This machine's Airport can't see ANY available networks. Sitting right next to my MacBook (identical model), hers is blind while mine can see several open and locked networks including my own Airport base station. If I choose to "Join Other Network..." and enter the network name and password for my network, her machine almost immediately gives me a "Connection timed out" error. It doesn't matter where her MacBook is, it can't see any networks anywhere.
This is a new problem as her Airport was working fine for the first few months. I've just finished making sure all software updates have been applied so she's now running the latest-greatest, but still no Airport.
This sounds similar to the problems other folks here are describing so I figured I'd add my voice to the chorus. I guess I'll take her machine down to the local Apple store this afternoon and see if they have any ideas. At this point I wouldn't be surprised if her Airport card was fried.
Calenlas

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