Why does my MacBook keep turning off Airport?

For the past few days my Airport on my MacBook has been turning off. There are four other Mac laptops that access the same Wi-Fi in the house, and none of them have this issue. There are also five iPads of varying age, a few iPods and four iPhones (we are only on Apple products at this time). None have this issue.
To start: YES, I have turned it off and on again! I work IT, mainly with radios, but I know that step is the first to be asked. I have turned it ALL off and then on again. Please, do not insult my intelligence by asking that question.
When I go into "Network Preferences" and look, there is no connection, and nothing I do turns it on. I then turn Airport off and on again, select the only network the computer has ever been connected to (it never leaves the house), and then it works. I am getting a little frustrated with the whole issue. Any suggestions?
It is a white, 2009 MacBook, 15 inch. It is running Mac OS X Version 10.5.8.
Thanks for looking at the post!

Resetting the NVRAM could solve the problem.
http://support.apple.com/kb/HT1379?viewlocale=en_US
Or Finder Go menu > Goto... ~/Library/Preferences then delete the files called "com.apple.internetconfig.plist" and "com.apple.internetconfigpriv.plist" then reboot coud solve the problem.

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