Apple macbook air 13 inch User Manual

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Chapter 3   
Problem, Meet Solution
Make sure your MacBook Air is connected to the Internet by using an Ethernet or Wi-Fi
network. (To connect to a Wi-Fi network, follow the instructions on page 43.)
In the Mac OS X Utilities pane, select Disk Utility and click Continue.
Select the disk in the list on the left, and then click the Erase tab.
Select Mac OS Extended (Journaled) from the Format pop-up menu, type a name for
the disk, and then click Erase.
After the disk is erased, choose Disk Utility > Quit Disk Utility.
In the Mac OS X Utilities pane, select Reinstall Mac OS X and click Continue.
To reinstall Mac OS X and your applications, follow the instructions in the Mac OS X
Installer.
After restoring Mac OS X and your Apple applications, you can selectively restore your
other data and applications from a Time Machine backup.
Checking for a Hardware Problem
If you suspect a hardware problem, use the Apple Hardware Test application to help
determine if there’s a problem with one of the MacBook Air components, such as the
memory or processor.
To use Apple Hardware Test:
Disconnect all external devices from your MacBook Air except the power adapter.
Restart your MacBook Air while holding down the D key.
When the Apple Hardware Test chooser screen appears, select the language you want
to use.
Press the Return key or click the right arrow button.