Apple MD231LL/A manual Checking for a Hardware Problem, To use Apple Hardware Test

1Make 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.)

2In the Mac OS X Utilities pane, select Disk Utility and click Continue.

3 Select the disk in the list on the left, and then click the Erase tab.

4Select Mac OS Extended (Journaled) from the Format pop-up menu, type a name for the disk, and then click Erase.

5After the disk is erased, choose Disk Utility > Quit Disk Utility.

6In the Mac OS X Utilities pane, select Reinstall Mac OS X and click Continue.

7To 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:

1Disconnect all external devices from your MacBook Air except the power adapter.

2 Restart your MacBook Air while holding down the D key.

3When the Apple Hardware Test chooser screen appears, select the language you want to use.

4Press the Return key or click the right arrow button.

46Chapter 3   Problem, Meet Solution