Airport not detecting any Networks

I was working fine yesterday with my macbook late 2008 aluminum unibody. Then I left the laptop for a while to have some lunch. When I went back to my mac it hanged so I forced quit some applications then did a hard shutdown. After which my Airport cannot find any network. I did a hardware test... all is okay (does this also test the airport card?). I also tried to manually input the SSID and the WEP Password (13 Characters) where I get an error of Connection timed out.
Can anybody help me?

Open /Applications/Utilities/Disk Utilities
Once in Disk Utilities select your drive in the left window. Then from the right window select First Aid (First Aid will be selected by default).
Verify Disk:
In the "First Aid" window towards the bottom, select Verify Disk. If "Verify" comes back reporting errors, then post back here as we will have to give you further instructions on booting from your install disk.
Also at the bottom note the S.M.A.R.T status, it should read "Verified"
Repair Permissions:
In the "First Aid" window towards the bottom select "Repair Disk Permissions"

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Hello everyone, I just updated my 3GS from iOS 5.0.0 to 5.0.1 Since the update, Itunes says that no SIM card is detected, and the iPhone says that it cannot be activated. It also obviously does not detect any network. I tried restarting the phone se

Hello everyone,
I just updated my 3GS from iOS 5.0.0 to 5.0.1
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Here is a link to HP PCs - Troubleshooting your wireless network and Internet connection (Windows 7) that may also help.
Have you ran the HP Support Assistant ?
Have you tried using MS Fix It?
You may choose to contact HP support for assistance with this difficulty.
Please call our technical support at 800 474 6836. If you live outside the US/Canada Region, please click the link below to get a support number for your region.
World Wide Phone Support
Good Luck!
Sparkles1
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the bottom right to say “Thanks” for helping!

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Hello,
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Please try to reinstall the networking drivers from recovery manager and also please inform the status of the wireless button .Does it stay orange or does it turn blue.
*Remember to mark your questions solved and click the "Kudos" star to show your thanks!

Airport not detecting wireless networks

I have a MacBook that is about 5 years old. Latley, Airport has had trouble recognizing any wireless networks. Sometimes it works, and sometimes it doesn't. I know that there are networks available because other devices are connected. Recently it has stopped working all together. Has anyone else experienced the same problem and know how to fix?

Try resetting the SMC and PRAM
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Resetting NVRAM / PRAM
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