Some Mac computers that shipped with OS X Lion v10.7 or later will start up from AHT over the Internet if your startup disk doesn't contain AHT, or if you hold down Option-D at startup. ![]() To quit Apple Hardware Test, click Restart or Shut Down at the bottom of the window.When the test is complete, review your test results in the lower-right section of the window.This performs a more thorough test that takes longer to complete. Optionally select 'Perform extended testing' before beginning the test. To begin testing, click the Test button, press T, or press Return.If you aren't using a mouse, you can use the up and down arrows to select a language, then press the Return key. Select your language and click the right arrow.Keep holding the D key until you see the Apple Hardware Test icon: ![]()
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