Apple Hardware Test

Intel Macs:

  1. If the computer is already on, insert the Mac OS X Install DVD 1 into the optical disc drive, and then restart. If the computer is not on, turn it on and insert the disc as soon as possible after startup.
  2. Hold down the D key before the gray startup screen appears (not the C key).
  3. It takes a minute or so for Apple Hardware Test to start up and inspect your hardware configuration. When the process is complete, you are asked to pick a language. Select your language and click the right arrow. If you aren't using a mouse, you can use the up and down arrows to select a language and then press the Return key.
  4. The Apple Hardware Test console appears. You can choose what sort of test or tests to perform:
  • To perform all of the basic tests, click the Test button or press the T key or the return key.
  • To perform a more thorough diagnostic test, select the "Perform extended testing" checkbox under the Test button before you click the Test button.

PowerPC Macs: The Apple Hardware Test was originally distributed on a separate Apple Hardware Test CD. The latest Macs distribute the Apple Hardware Test on a special volume on the Software Restore and Install DVD. This DVD, part of the discs that shipped with your Mac, is often labeled Mac OS X Install Disc 1. Each Apple Hardware Test is specific to the type and model of Mac with which it was distributed. To run the Apple Hardware Test, you must start up from the disc or volume containing the test: If you have an Apple Hardware Test CD, start up from it as you would any other bootable disc:

  1. Insert the Apple Hardware Test disc that came with your Mac into your Mac's optical drive.
  2. Restart your Mac (Select Restart in the Apple menu)
  3. Immediately press and hold the C key on your keyboard.
  4. Release the C key after the Apple Hardware Test appears on your display and indicates that it is loading.

If your PowerPC-based Mac has an Apple Hardware Test volume on the Software Install and Restore DVD, (Mac OS X Install Disc 1):

  1. Insert the Software Install and Restore DVD that came with your Mac into your Mac's optical drive.
  2. Restart your Mac using either of the following methods:
  • Select Restart in the Apple menu.
  • Press the Command-Control-Eject keyboard combination.
  1. Immediately press and hold the Option key on your keyboard. This invokes the Startup Manager.

4. Release the Option key after the Startup Manager appears on your display. 5. When the wristwatch progress indicator disappears indicating that the Startup Manager's scan for bootable volumes has completed select the Apple Hardware Test volume. Click the right-pointing arrow. Your Mac will continue to start up from the Apple Hardware Test volume.

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