If you installed Mac OS X Lion and you connect to the internet via AirPort, mysteriously,after a reboot you may find yourself with the Wi-Fi icon in the menu bar off the Finder and going to reactivate it you will see the message “No hardware installed “, as if the AirPort card had failed or not you had ever had.
After several unsuccessful attempts, including the classic Mac restart, repair permissionsvia Disk utilty propitiatory dance and Indian, I found that to restore the functioning of theWi-Fi need to reset the System Management Controller (SMC).

It is a simple operation that any user can complete successfully, but it varies from Mac toMac Here’s how:

 

Mac mini, iMac, Mac Pro and Xserve with Intel

– Shut down your Mac

– Disconnect the computer power

– Wait 15 seconds and then plug the power cord

– Wait five seconds and press the power button to start the Mac

Mac laptops with removable battery

– Shut down your Mac, making sure that Turn off power supply from mains

– Remove the battery and then press the power button for 5 seconds

– Replace the battery, connect the power supply and turn on the computer

Mac laptop battery is not removable

– Shut down your Mac and connect the power supply

– Press Ctrl-Shift-Option (alt) and the power button.

– Release the keys and power button simultaneously

– Turn on the laptop

 
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