Loss Airport Connectivity

I have been using for months a PowerBook G4 Titanium 400Mhz with an Airport card, connected to a D-Link DI-524 router. This setup has been working without a problem (not very fast but without problems!). Today, without any visible reason, Airport stop recognizing any network. I haven't changed a thing and a MacBook Pro sitting just beside is recognizing two available networks (and using one of them).
Trying to solve this issue, I already have:
1. shut down everything (computer, router…) and start again
2. reset the PRAM
3. take the Airport card off and insert it again
4. check if the card slot's connection to the logic board where loose
5. do the ‘press the antenna’ trick (used for some people to improve range)
None of these things solved the problem and the PowerBook remains unconnected…
Any ideas? Thanks.

My airport started working "erratically" a few weeks ago. It would be fine for a while but then drop the connection and, like tomasgf, it wouldn't even recognise a network let alone connect to it. Then, an hour later or so, it would recognise the network and automatically connect again. And all the time my other computer was connected fine so it wasn't a problem with the router.
Because it kept coming and going I thought it was probably an antenna problem - most likely the cable being pinched by the display hinge) so I started being very careful to not move the screen at all. (I think on all Ti-Books the antenna goes through the hinge and around the edge of the display.)
However, it still dropped it and then randomly found it even when I just left the whole thing alone. So I decided to open her up and check that the Airport Card was properly seated and the antenna cable was plugged in. Both looked fine. So I was somewhat stuck.
Took it to a Genius in the Regents Street store a few days later and, once he'd congratulated me on my 'antique', he couldn't think of anything that would cause the problem off the top of his head. So he opened her up to check things as I had done and concluded all was okay. He also booted up from an external disk and it still wouldn't pick up the network which shows that, for me at least, it isn't a software issue.
It didn't work at all for a few days and then, about a week ago, it started working and has been perfect since. I've been opening and closing it at will, shifting the screen freely, and it's fine. I've not added any applications let alone updating any software at any point (and even when it started wasn't after any system alterations).
So, maybe somewhat uselessly, I cannot offer a solution other. Merely wanted to document that this could inexplicably happen. I guess I feel that it is most likely an antenna issue so I sadly expect it to recur. However, the cost and ease of putting a new ethernet card with it's own antenna in the PC card slot will likely lead me to do that rather than opening up the display casing to find the true cause of the problem.

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