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10.7: Restore Apple Hardware Test boot mode 22 comments Create New Account
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On the one hand Apple now recommends you simply use the disks that came with your Mac on the other hand Apple says 'discs are dead' and removes optical drives from Macs. How crazy is this?
But great hint :-)

Had our esteemed moderator tested this hint, he would have found it doesn't work as described. System/Library/Core Services is only writable by the user when preceded by 'sudo'. Thus, the correct syntax should be

Yeah, you're quite correct! Sorry for the mistake.
Somehow I forgot to add that in when writing the hint (or I was using the root account at the time….)
Anyway, yes, sudo must be used. (It would be nice if the original hint could be modified. :))

Fixed it. Thanks for the catch.
-- The esteemed moderator

Had out esteemed smarta$$ looked, he'd have seen that Baltutis below posted the correct command.
If you're gonna call someone out, be smarter.
sudo cp -R /Volumes/[your INSTALL DISK name]/System/Library/CoreServices/.diagnostics /System/Library/CoreServices

If you use the discs that came with your Mac, you can also simply install the 'CPUHelpFiles.mpkg' metapackage, usually on the Applications Install Disc (part of 'Install Bundled Software': select only 'CPU Help Files' and deselect everything else): this will install AHT and also the documentation files for your machine.

I forgot about the CPUHelpFiles package because other utilities in there (such as the processor pref pane seem to be broken now), but that does work if you would prefer not to use terminal.

Well, rather, the 'Processor' preference pane was an optional part of the Developer Tools (up to version 3.x for Snow Leopard), while 'CPUHelpFiles.mpkg' installs only AHT and the machine-specific documentation stuff inside '/Library/Documentation/User Guides And Information': so, it should be quite safe too install, as there are no extra utilities there.

Of course, *to* install (not 'too')..

I'm pretty sure this doesn't work if your boot volume is encrypted. You'd need to create a separate unencrypted boot disk/partition, boot to that, install AHT, then boot into AHT.

On encrypted systems, there is a small booter partition which contains the EFI application that asks for your password, loads the kernel from the booter partition and once the kernel found and unlocked your encrypted volume, system startup continues as usual.
If your system has the recovery system (and most Lion installs should have), it and the booter share a partition after your root volume. diskutil list will confirm there is this hidden partition called 'Recovery HD'. If your system for some reason does not have the recovery system, but you encrypted the root volume, the partition will be named 'Boot OS X'.
Either way, just mount this hidden partition ('diskutil mount Recovery HD' or 'diskutil mount Boot OS X') and then copy the .diagnostics folder to /Volumes/{Recovery HD Boot OS X}/System/Library/CoreServices.
After that, you can boot to AHT by holding D, like on unencrypted systems.
It is probably a good idea to copy AHT to the Recovery HD, regardless of the encryption status of your root volume, but I haven't tested if the firmware finds AHT there when the partition is not the first HFS+ volume on your primary disk.
Curiously, one can boot the recovery system, but not AHT, when the firmware password is set..

I just tried doing this, but there isn't enough space on the recovery volume to copy all of the files in the .diagnostics folder. : (

Maybe I'm wrong, but the command should be:
sudo cp -R /Volumes/[your INSTALL disc's name]/System/Library/CoreServices/.diagnostics /System/Library/CoreServices/

You are correct, BT! Slight difference, but then that's what makes things work or not!

FYI, I couldn't get 'D' to work on a 2011 MacBook Air. My drive is encrypted and I had a firmware password turned on. Once I disabled the firmware password, 'D' worked. That's a bit unfortunate, as what if my drive has died? How can I reach the recovery partition to disable the firmware password to get to the hardware test.

great hint but AHT is pretty worthless and no longer really used. If you want to run diags on your computer that will actually do something, use apple service diagnostics (ASD) for your model instead

I could not find my original disks, but was able to restore the .diagnostics folder from a pre Lion upgrade time machine backup. Had to show hidden files first, but then just went back far enough and restored that one folder. Boot while holding D worked fine.

HELP! Can't do ANY diagnosing on Late-2011 MBP w/ 16GB RAM! :-(((

Alright, I still don't understand how to find either the 'Holding the D' function and/or some other utility (3rd party or Apple) for those of us who have a (Late-2011) MacBook Pro!? No disks, just a useless SuperDrive and no USB stick either. I did make myself my own USB restore flash drive, however, and I also have the Recovery HD partition unhidden, mounted, but I just cannot seem to locate this '.diagnostics'..folder(is it?) or is it a pkg or a file? :-( System files are also visible, so I did some manual searching for the elusive diagnostic 'something-or-other'. No dice across the board. :(
I would really like to check my 2x8GB RAM chips, which, thus far, work perfectly fine and show up correctly everywhere they should, including System Info/Profiler, 'About this Mac', iStat Menus, Activity Monitor, and a few others. I just want to make sure, as I had not heard of that memory company before and the price was incredible ($139 shipped, no tax for BOTH from a seller on Amazon).
Thanks for helping! ;-)

I've got MacBook Pro (15-inch, Late 2011) with Apple Hardware Test originally accessed by holding D at startup.
However after restoring Mac OS X Lion by the Internet using Lion Recovery D-key stopped working. I've followed the tip and copied .diagnostics folder:
ls -al /Volumes/Macintosh HD/System/Library/CoreServices/.diagnostics/
total 48
drwxr-xr-x 3 root wheel 102 Feb 13 16:06 .
drwxr-xr-x 125 root wheel 4250 Feb 13 16:06 .
-rwxr-xr-x 1 root wheel 22590 Feb 13 16:06 diags.efi
ls -al /Volumes/Recovery HD/System/Library/CoreServices/.diagnostics/
total 48
drwxr-xr-x 3 User staff 102 Jun 27 2011 .
drwxr-xr-x 4 User staff 136 Jun 27 2011 .
-rwxr-xr-x 1 User staff 22590 Jun 27 2011 diags.efi
However the D-key still doesn't call AHT as expected.
What else should I try?

Hi, did you ever manage to get anywhere with this?

I confirm that this method still works with 10.8.5 installed on a Feb 2011 macbook pro.

On newer Macs (which shipped with Mavericks), Apple Diagnostics initially is on the Recovery HD; so, after mounting it with:
$ diskutil mount Recovery HD
.. Apple Diagnostics is in the folder:
/Volumes/Recovery HD/
So, the best thing to do would be to make a copy of this invisible folder (personally, I zipped it and stored it on an external hard drive), in order to be able to restore it if you reinstall OS X (which also updates the recovery partition, removing the '.diagnostics' folder); when restoring it, also remember to restore the original permissions for the '.diagnostics' folder and its contents: i.e., essentially, root read-write, wheel read-only and everyone read-only.
Sadly, presently there seems to be no way to re-download Apple Diagnostics from Apple and reinstall it: so, if you didn't make the backup copy from your initial, out-of-the-box setup, the only option remaining is the Internet-based one, as also explained here:
(Probably, the situation is similar also for Macs which shipped with Lion and Mountain Lion (with AHT)..)

To an average computer user, any challenge with the hardware or even software warrants the need of a technician. This need not be the case and as a matter of fact, it is quite easy to troubleshoot some of the common problems that your PC might be facing.


Especially with some of the hardware diagnostic software that we will be discussing, you can be sure that the trips to the technician will be lessened considerably.

PC Doctor

PC Doctor is a health solution for computer systems and will ensure that all the hardware aspects of your computer are running appropriately as well as intelligent messaging and proactive system monitoring. With the tool, you will be able to serve a vast majority of users in Windows OS as well as Android including Marshmallow 6.0.

HP PC Hardware Diagnostics

HP PC Hardware Diagnostics tool comes installed to all the latest machines manufactured by HP. It is inbuilt and in the BIOS and thus you do not need an OS so as to gain access to it, and this implies that even when you OS has failed, you are still able to do diagnostics.

Pc-Check – Computer Hardware Diagnostic Software

Pc-Check-Computer Hardware Diagnostic Software is a tool that has a wide range of applications in reporting on the hardware status of the computer. It is an ideal tool for use by manufacturers, computer refurbishing companies, repair centers, and even for a hobbyist. It is reliable and a solution that is easy to use.

Other Platform

Hardware diagnostic softwares are very particular when it comes to the platform they will ride on. As much as the developer of the software can be in a position to develop one for the other platforms, it is not an easy task. Especially for PC and Mac, the ridge is too wide and obviously conspicuous.

Hardware Diagnostic Software For Windows – BurnIn Test

BurnIn Test is a hardware diagnostic tool that enables the major hardware components of a computer system to be tested for stresses. This is used to determine the reliability, endurance, and stability of the system. The tool is ideal for conducting diagnostics and troublesahoots and also helps to avoid dead machine to clients.

Hardware Diagnostic Software for Mac – DiskWarrior

Disk Warrior is the most advanced repair and recovery tool for the mac users and allows you to restore your data from a single click. The tool is amazingly easy to use and very reliable. With this software, you will be able to get back up to what you were working on fast.

Hardware Diagnostic Software for Android – Phone Tester (hardware info)

Phone Tester (hardware info) is an Android based hardware diagnostic tool. It gives you the status and condition of the components of your device. With this, you are able to get details on the components such as WIFI, battery, Network adapters, Bluetooth devices, major sensors, touch screen and many others.

Most Popular Software for 2016 – EVEREST Ultimate Edition – PC Diagnostics

EVEREST Ultimate Edition is a computer diagnostic tool that gives you the ability to view all the information of the components installed on the computer. D-link dfe 530tx driver. This is the PC diagnostics software utility that assists you while installing, optimizing or troubleshooting. At the same time, it is also possible to get the drivers that are installed on your system.

What is a Hardware Diagnostic Hardware?

A hardware diagnostic software is a tool that is able to troubleshoot the errors in the hardware of a computer system. From this, it can give a report that can help in averting a bigger risk or even for the purposes of general information.You may also see Driver Manager Software

These tools are very essential especially when it comes to handling multiple computers as they are key in ensuring that minimal time is spent especially in manufacturing, refurbishing and repair companies. With some of the tools, there is enhanced performance, and they form an ideal companion for home users who may be interested in the health status of their computers.You may also see Disk Cleaner Software

We have been in a position to view some of the best soft wares that are available in the market in the category of hardware diagnostic. It is impressive to find that there are tools even for the mobile platforms, and this indicates how important these type of softwares are.

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