How to use Apple Hardware Test on Macs sold through June 2013

First of all we will say that it is this Apple Hardware Test also called, AHT, it includes a set of diagnostics that test the Mac hardware to see if everything is working properly and for this it is best to perform this test offered by Apple itself.

We have to make it clear before starting the process that this method to find a possible hardware problem on our Mac is only valid for equipment purchased before June 2013. For the rest of the Macs purchased after this date we will have the AHT in another tutorial that we will publish on Monday.

After the possible detection of a problem on the Mac possibly related to the hardware of the computer, by performing this simple test we can determine which component is causing it. So let's see the steps we have to follow to perform this test.

How to use Apple Hardware Test

  1. We will disconnect all external devices except the keyboard, the mouse, the screen, the Ethernet connection and the connection to the power outlet. Apple Hardware Test may show an error message if you don't disconnect all other devices, so don't forget about it.
  2. Make sure your Mac is on a solid, flat, and stable work surface.
  3. We turn off the equipment and we can start the test.
  4. Turn on your Mac and hold down the D key on your keyboard. Hold down the D key until the Apple Hardware Test icon appears:
  5. We will select the language and click on the right arrow. If you are not using the mouse or trackpad, you can use the up and down arrows to select the language and then press the Return key.
  6. To start testing, click the Test button, or press the T key or the Return key. You can also select Perform extended testing before starting testing. This will perform a more thorough test that will take longer to complete.
  7. When the test is complete, review the results in the bottom right of the window.
  8. To exit Apple Hardware Test, click Restart or Shut Down at the bottom of the window.

Other details to consider

  • Some Mac computers that ship with OS X Lion v10.7 or later will boot from Apple Hardware Test over the Internet if a copy of the disk is not found on the startup disk or if you hold down the Option-D keys during startup. An Internet connection via Ethernet or Wi-Fi is required.
  • If you are using OS X Lion v10.7 or earlier and cannot start AHT, see if you have an OS X installation disc called "Applications Install Disc 2". Insert it into the internal optical drive or an external SuperDrive before following the steps above. If you are using a MacBook Air (Late 2010), connect the MacBook Air Software Reinstall pen drive to the USB port.

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  1.   Daniel Parody said

    Check the title of the note, since it seems that it only refers to the 2013 Macs. I have a mid 2012 MBP and I hardly read it because of the wrong heading.
    Thank you

    1.    Jordi Giménez said

      Reviewed and thanks for the input Daniel!