Apple MacBook Air (Late 2008), (Mid 2009) - Manual (Page 50)

50 Chapter 3 Problem, Meet Solution
3 Choose Installer > Open Disk Utility. When Disk Utility opens, follow the instructions in
the First Aid pane.
Problems with AirPort Extreme Wireless Communication
If you have trouble using AirPort Extreme wireless communication:
 Make sure the computer or network you are trying to connect to is running and has a
wireless access point.
 Make sure you have properly configured the software according to the instructions
that came with your base station or access point.
 Make sure you are within range of the other computer or the network. Nearby
electronic devices or metal structures can interfere with wireless communication and
reduce this range. Repositioning or rotating the computer might improve reception.
 Check the AirPort (Z) status icon in the menu bar. Up to four bars appear, indicating
signal strength. If signal strength is low, try changing your location.
 See AirPort Help (choose Help > Mac Help, and then choose Library > AirPort Help
from the menu bar). Also see the instructions that came with the wireless device for
more information.
Problems with Your Internet Connection
Your MacBook Air has a Network Setup Assistant application to help you set up an
Internet connection. Open System Preferences and click Network. Click the “Assist me”
button to open Network Setup Assistant.
If you have trouble with your Internet connection, try using Network Diagnostics.