Apple MacBook Air (11-inch, Mid 2011) - Manual (Page 43)

43 Chapter 3 Problem, Meet Solution
 Reinstall Mac OS X and Apple applications.
 Restore your computer to its factory settings by erasing its disk and reinstalling
Mac OS X and your Apple applications.
If your computer detects a problem, it opens the Mac OS X Utilities application
automatically. You can also open it manually by restarting your computer.
To open the Mac OS X Utilities application:
m Restart your computer while holding down the Command (x) and R keys. The Mac OS X
Utilities pane appears.
Important: If the Mac OS X Utilities application doesn’t open after restarting, hold
down Command (x)-Option-R and restart the computer to access the Mac OS X
Utilities software from the Internet. Your computer must be connected to a network
that has access to the Internet.
Some utilities in the Mac OS X Utilities application require access to the Internet and
the Mac App Store. You may need to make sure your computer is connected to the
Internet by using your Ethernet or Wi-Fi network.
To connect by using a Wi-Fi network:
1 Choose a network from the Wi-Fi status menu in the upper right corner of the screen.
2 If necessary, type the network password.
To join a closed network, choose Join Other Network. Enter the network’s name
and password.