Skip to main content

How to use Apple Hardware Test and Apple Diagnostics

Troubleshooting 101 -- at its core -- involves identifying a problem on a computer and using that information to resolve any issue(s) stemming from said problem. While most troubleshooting takes place at the OS level, there will inevitably come a time when the hardware itself will be the cause of a system's instability.
Many 3rd-party tools exist to root out hardware trouble, sometimes heuristically, even before the component has failed. But many Mac owners do not know that Apple bakes in a utility specifically to test hardware found in Apple computers of all sizes.
There are two utilities, as a matter of fact, and depending on when your device was manufactured, you'll access Apple Hardware Test if your computer was manufactured prior to June 2013. If the computer was manufactured after that date, then Apple Diagnostics is the utility that will load. They're both very similar in what they accomplish -- a self test of the hardware, complete with scans of internal storage devices.
The look of the utilities will differ, since Apple Diagnostics is newer and aesthetically keeps the same design principals as those found in OS X Mavericks. Also, the inclusion of internet connectivity, which adds access to Apple's online support pages to assist in troubleshooting, is a huge benefit -- and it eliminates the need for a secondary device to perform research while trying to tackle a problem on the primary unit.
Let's take a look at how to invoke the utilities when needed:
  1. The computer must be turned off. If it is not, please shut it down prior to beginning.
  2. Press the power button to power on the computer.
  3. Immediately after pressing the power button, press and hold the [D] button on the keyboard. Continue to hold down the key until the Apple Hardware Test (AHT) icon appears or the Apple Diagnostics (AD) language selection menu loads.
  4. At this point, the next step will depend entirely on the version of the utility that loads. For AHT, go to step 4a; For AD, go to step 4b.
    • 4a. Once the console is fully loaded, using a mouse or keyboard click the Test button or type in T to begin the self-test. If you wish to perform a more thorough test, check the "Perform extended testing" check box before beginning the test. This examination takes longer to complete, but it provides in-depth checking of RAM addresses and Hard Drive sectors for errors.
    • 4b. Once the language is selected, the computer will begin the self test, which takes 2-3 minutes on average. When the test is complete, any issues detected will be listed on the subsequent screen. Helpful links to resolving many of these issues may be included, directly from Apple's support site. Additionally, AD uses reference codes to identify specific issues pertaining to hardware and potential failures. These codes can be used to further breakdown a problem or contact Apple technical support directly from AD.
Elegant, yet simple are words I use to describe Apple and the approach they bring in everything they create -- from hardware to software. The sleek polish combined with ease-of-use shines through every single time.
This lays in stark contrast to potentially difficult situations that occur while troubleshooting software. With all its variables and the general lack of replacement parts on-hand, testing hardware can become quite daunting and very expensive, especially with newer Mac computers and their all-in-one layout, where each component is soldered, glued, or both to the logic board.
Luckily, Apple has once again made it extremely easy for end users to determine which version of the hardware utility to use or how to make sense of error messages and alerts displayed by Apple Hardware Test.

Comments

Popular posts from this blog

How to run Android on Windows Mobile Phone

Install Android on your HTC Windows Mobile phone – Guide

Welcome to the official XDANDROID AOSP thread which is dedicated to getting Android running on our beloved HTC devices.
Phhusson: has dedicated most of his time helping users and updating kernel to run Eclair and his work for other msm7k devices. However phhusson is not alone as there are also other members working on this. You can find some of them on http://www.htc-linux.org. I've listed some of the developers i know of that currently are working on and they deserve credits and thanks. We also have to note that before this work done there was quite a substantial number of people starting working on linux for our devices. Without them we may not be where we are today. So respect and credits to everyone involved in working on linux kernel for msm devices.
I am not responsible for any damages or problems your device encounters. The build is relatively safe and shouldn't cause any problems.

This tutorial wil…

How to Disable Windows 10 Update

Windows 10 Forces Me to Update"Every time I try to shut down my computer, I was forced to update my Windows 10. But I really don't want to update my operating system because the automatic update might take up the system and network resources. Is there anybody can help me solve this problem and disable Windows 10 update? Thanks in advance." Whenever you are faced with Windows 10's automatic update notification like: Install updates automatically Download Updates but choose when to install themCheck for updates but let me choose whether to download and install them What would you do? Here, we have the following solutions. All solutions to disable Windows 10 update: Solution 1. Disable Windows Update ServiceSolution 2. Change the Setting of the Group Policy EditorSolution 3. Meter Your Network ConnectionSolution 4. Change the Way of Windows 10 Updates Using Registry TipsBefore proceeding with the four solutions to fully stop Windows 10 updates, check your own Windows 10 ed…

How to Format a Large Hard Drive With FAT or FAT32

32 GB is the file size limit for partitions when formatting with the FAT or FAT32 file system on Windows.What A File System Is & How You Can Find Out What Runs On Your DrivesWhat A File System Is & How You Can Find Out What Runs On Your DrivesREAD MORE Well, as some of you will know, FAT/FAT32 can actually handle up to 16 TB hard drives and up to 2 TB are supported in most operating systems. Microsoft has set a 32 GB partition size limit for the FAT/FAT32 file system to promote NTFS, which is generally more efficient when working with large partitions. In truth, this limitation only exists in recent versions of Windows. Moreover, Windows does recognize large hard drives formatted with FAT/FAT32. Finally, you can circumvent the 32 GB limit. In this article, I will show you how to format a large hard drive with FAT/FAT32 or create a 32+ GB partition with that file system. The Manual Way You don’t need a tool to circumvent the 32 GB partition limit, you can manually format your …