Apple Laptop Apple MacBook Air MD712LL/A 11.6" LED Notebook User Manual

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44 Chapter 3 Problem, Meet Solution
Using Apple Hardware Test
If you suspect a problem with the MacBook Air hardware, you can use the Apple
Hardware Test application to help determine if there’s a problem with one of the
computer’s components, such as the memory or processor.
To use Apple Hardware Test on your MacBook Air:
1 Disconnect all external devices from your computer except the power adapter.
2 Restart your MacBook Air while holding down the D key.
3 When the Apple Hardware Test chooser screen appears, select the language for your
location.
4 Press the Return key or click the right arrow button.
5 When the Apple Hardware Test main screen appears (after about 45 seconds), follow
the onscreen instructions.
6 If Apple Hardware Test detects a problem, it displays an error code. Make a note of the
error code before pursuing support options. If Apple Hardware Test doesn’t detect a
hardware failure, the problem may be software related.
For more information about Apple Hardware Test, see the Apple Hardware Test Read
Me file on the Mac OS X Install Disc 1.

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