Airport turns off Intermittently, will not turn back on?

Hello!
I have a black Macbook that I bought in late July of 2008. I love my computer, and since getting it for school my entire family has all switched to Apple products.
I am having an issue with my Airport Card. Basically, it turns off at random and will not turn back on when I click on the "fan" and select "Turn Airport On." I have to shut down (not restart) my computer in order to get the card to work. Sometimes it takes two or three times shutting the computer down for Airport "bars" to come back on.
If I shut it down and the "fan" does not appear upon restart and I click on it, it reads "no airport card installed."
My frustration is that this happened to me about 8 months ago and I had the airport card replaced, at the suggestion of a Mac genuis at my local Apple store. I have had no problems until about 2 weeks ago, when this started happening again. It is so annoying, especially when I am using the internet for school work. I would really like to not have to purchase an entire new computer over this, so I appreciate any feedback you all have.
There are other similar discussion threads like this, but they have been archived.
Thanks for your help!

Sounds like you have a power surge and that tripped the breaker, however your battery should have worked, perhaps it's not charged.
Perform a SMC reset
https://support.apple.com/kb/HT3964
check your magsafe
https://support.apple.com/kb/TS1713

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