Airport won't turn on after Leopard re-install

I have a mid 2005 iBook G4 that I upgraded to Leopard shortly after it was released. I also replaced the HD about 4 months ago.
About a month ago my OS started crashing. Sometimes accompanied by a startling and scratchy sound from the speakers. Sometimes the screen fades and a box appears in several languages telling me I need to restart my computer. Other times there's a bunch of gobbledy-gook on the screen (text I don't understand). I know nothing about this kind of stuff, but I did notice it said something about a kernel panic. I'm not sure how to retrieve a log of the crash info to provide more detail.
After a few weeks of this fun, I finally decided to re-install Leopard (I was sure to archive and preserve settings) and since then my airport has been refusing to turn on. I click the button that says "Turn Airport On" under network prefs but it doesn't respond. Turning it on using the menu bar at the top doesn't work either. I've tried restarting to no avail.
Is there anything else I can do to get my Airport to turn on? Could a busted airport card have been causing the kernel panic and OS crashes? Do I need to spend more money having the Mac Store repair it? I've already spent $200 on repairs and am starting a PhD dissertation soon -- I'm thinking this might be a good excuse to get a new Macbook.
Thanks for the help.

After installing updates a 2nd Airport suddenly appeared in my network preferences. I set that one up to work off my wifi network and the old one went away. Now it works fine! Now I'll just have to see if it still crashes....

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