Can no longer see ANY wifi networks

I have a 4.5 year-old PowerBook (titanium) 550... it seems my airport card is simply no longer working. No matter where I am, even when I know there is a network there and I have the password to access that network, my airport card cannot seem to see any networks. This includes networks that I control and know the settings have not changed.
This started about a month ago; for a few days I couldn't see any networks. Then, suddenly, I was able to, and connect without a problem, for about a week. Now, however, it seems the problem has returned and is permanent.
Any ideas? Could the internal antennas be messed up? Or do the airport cards sometimes just go bust?
thanks.

I have the EXACTLY same problem.
My Apple TV (3rd generation) does not attemp to find any wifi networks since two day ago.  Sometimes it does find and connnects to my home wifi network, but it loses connection in  a couple of minutes at the longest.  When I plug in an ethernet cable, the apple TV works just fine.  But when I disconnect it, same thing happens all over again.  I have tested several modifications and now I am sure this is not an issue  of the router or the network settings.
If anybody has a solution, please be kind to let me know.  I can't even get my apple TV replaced since I'm overseas.

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