Download And Run Apple Hardware Test Aht From A Usb Drive

Fortunately it s an easy feature to restore.

Download and run apple hardware test aht from a usb drive. Apple diagnostics shows a progress bar while it s checking your mac. To repeat the test click run the test again or press command r. Apple hardware test aht is a diagnostic cd that is distributed to customers who purchase a new apple computer.

If you have misplaced the apple hardware test cd that came with your computer you can download the appropriate cd image listed below and burn an aht cd. Unless you have a mac released after july 20 2011 lion removes the ability to hold d at startup to boot into apple hardware test. I have been separately told this still works for el capitan and later but not tried it.

Apple now recommends you simply use the disks that came with your mac. Apple hardware test aht description. While you could run the aht software from a dvd or usb external drive this article apple hardware test will not start up seems to explain how to reinstall them on to your normal boot drive.

Learn about apple diagnostics reference codes. In principle you can start them by holding the d key while booting. Apple service diagnostic asd is apple s bootable hardware testing console that lets you run extensive technical test routines on your mac.

Apple computers ship with a pre installed suite of hardware diagnostic tools known as apple hardware test aht. First you need an install disk. Alternatively apple hardware test aht is a simpler version of asd that is already on most mac os x restore dvd s that shipped with your mac.

You have a couple of options.