IBook G3 Cannot Detect Networks -- Other Computers Can

My boss's iBook G3 (dual-USB) cannot detect networks. Often the airport icon will not even load up in the menubar, and sometimes it loads, but shows no available networks. We are in a building with dozens of networks, but nothing shows up. Two other computers are accessing our network via Airport just fine. Any thoughts? This is driving us nuts! Any help would be much appreciated.
(By the way, this iBook has successfully connected to our network in the past. Yesterday and today it has just started misbehaving. Thanks again for your help.)

Thanks so much for taking the time to reply! The network settings have not been changed, so I don't think that it is an issue of b vs. g.
After leaving the iBook asleep for about an hour, I woke it and managed to get a signal (a few other available networks also showed up). Then I put it back to sleep for a few minutes to see if I would get a signal again. When I woke it up, the signal flashed from 4 bars to none, and the computer froze. Does this fact, and the fact that the Airport icon in the menu bar has been very, very slow to load (about 5 minutes) suggest that there is something wrong with the Airport software on the iBook?
Thanks for your help!

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That's been one of the more difficult parts – no connections work over any protocols/ports that I've tried, whether via browsing or Connect to Server..., though something is working (UDP?) to allow both computers to see each other in the devices list in the Finder.
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3/2/11 9:44 PM KernelEventAgent[37] tid 00000000 received event(s) VQ_LOWDISK, VQ_VERYLOWDISK (516)
3/2/11 9:45 PM hdiejectd[5532] quitCheck: calling exit(0)
3/2/11 9:58 PM quicklookd[6053] [QL] 'Creating thumbnail' timed out for '<QLThumbnailRequest /Volumes/jed/Documents/lost/food.eps>' (Start date: 2011-03-02 21:57:41 -0500)
3/2/11 9:58 PM KernelEventAgent[37] tid 00000000 received event(s) VQ_NOTRESP (1)
3/2/11 9:58 PM KernelEventAgent[37] tid 00000000 type 'afpfs', mounted on '/Volumes/jed', from 'afp_0X76lf1xMNqb4yHcGc0cKW9p-1.2d000006', not responding
3/2/11 9:58 PM KernelEventAgent[37] tid 00000000 found 1 filesystem(s) with problem(s)
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3/2/11 9:58 PM kernel AFP_VFS afpfs_DoReconnect started /Volumes/jed prevTrigger 0 currTrigger 1
3/2/11 9:58 PM kernel AFP_VFS afpfs_DoReconnect: doing reconnect on /Volumes/jed
3/2/11 9:58 PM kernel AFP_VFS afpfs_DoReconnect: posting to KEA EINPROGRESS for /Volumes/jed
3/2/11 9:58 PM kernel AFP_VFS afpfs_DoReconnect: Max reconnect time: 30 secs, Connect timeout: 15 secs for /Volumes/jed
3/2/11 9:58 PM kernel AFP_VFS afpfs_DoReconnect: connect to the server /Volumes/jed
3/2/11 9:59 PM kernel AFP_VFS afpfs_DoReconnect: connect on /Volumes/jed failed 60.
3/2/11 9:59 PM kernel AFP_VFS afpfs_DoReconnect: connect to the server /Volumes/jed
3/2/11 9:59 PM kernel AFP_VFS afpfs_DoReconnect: connect on /Volumes/jed failed 60.
3/2/11 9:59 PM kernel ]
3/2/11 9:59 PM kernel AFP_VFS afpfs_DoReconnect: posting to KEA to unmount /Volumes/jed
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3/2/11 9:59 PM kernel ASP_TCP CancelOneRequest: cancelling slot 1 error 89 reqID 6338 flags 0x29 afpCmd 0x22 so 0x70cab28
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3/2/11 9:59 PM KernelEventAgent[37] tid 00000000 found 1 filesystem(s) with problem(s)

IBook G3 Cannot Detect Networks -- Other Computers Can

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