Well, I recently had a problem with my brand new Compaq C769US laptop. The wireless would not work. Googled around and tried several different things, all of which wouldn't work. Then I found this guide that explained on how to get it working. If you have an Atheros 5007(EG) chipset on your WLAN card, then use this guide:
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Guide to get Atheros Chipset WLAN cards working 
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