How to start Apple Hardware Test under OS X Lion

Since I made the upgrade to OS X Lion I cannot start Apple Hardware Test with the old method that works under Snow Leopard.
Under OS X 10.6.8 I used to keep D key pressed until a picture appeared in the middle of the screen. With Lion it doesn't work, even under Wi-Fi internet connection.
Any suggestions?

Have a look at this discussion https://discussions.apple.com/message/15772841#15772841
Stefan

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HT201257 Holding down "D" no longer starts Apple Hardware Test! Any idea what's happened and how I fix it? Or do I need to go to the Genius Bar? MacBook Pro with Lion Preinstalled.

I have a MacBook Pro with Lion Preinstalled, so AHT was present on the hard disc and worked when the product was new. One of the first things I did from new was run AHT and it worked fine. But now it doesn't start - instead the machine (eventually) boots into normal OS X.
Holding down "D" no longer starts Apple Hardware Test! Any idea what's happened and how I fix it? Or do I need to go to the Genius Bar?
Software Mac OS X Lion 10.7.3 (11D50b), if it makes any difference.
Any ideas?

Thanks. However, even with an internet connection that doesn't work for me - the machine just (after an extended delay) boots normally. It doesn't download.
Option-D works for an Internet-based AHT. However that only works with an internet connection. It doesn't seem to download it and install it - it needs internet every time.
Any idea how my local copy of AHT disappeared? I haven't repartitioned the drive or knowingly deleted anything. And how do I reinstate it (because if you need AHT your hardware problems may preclude internet access!)?

Possible to create system software disc on USB flash drive to start Apple Hardware Test on mid 2009 iMac running OS X 10.9

Is it possible to create a system software disc on a USB flash drive to start Apple Hardware Test on mid 2009 iMac running OS X 10.9?

Hopefully, those dvd's are the correct ones. If not, it's possible to download the AHT for many models from Apple, & either make a bootable drive, or replace the files in the hidden /System/Library/CoreServices/.diagnostics folder.
see Download and run Apple Hardware Test (AHT) from a USB drive.
There are additional download details in the comments for some later models.

How to launch Apple Hardware Test from a USB optical drive?

Hi all!
First off, and before you guys starting proposing solutions I can't implement, I don't, repeat DON'T have a Firewire optical drive, nor am I going to buy one: I recently had to buy a USB LG optical drive to compensate for my SuperDrive going AWOL on me. I used said drive to reinstall OSX about a month ago, so this LG drive works just fine, thank you.
The thing is, I'd like to conduct an Apple Hardware Test, and I know you have to boot from OSX CD n°1 (in my case) to do that. Alas, since I can't boot from the CD in my SuperDrive by keeping the D key down, all I have is this LG thingy, and I wonder how I can conduct my hardware test with a USB optical drive.
I'll sum it up for you:
1) My SuperDrive isn't working, stopped working about the same time I installed this EFIng (guffaw, guffaw) Security Update 2009-001;
2) I don't have a Firewire optical drive;
3) All I have is a USB optical drive and MacOS X CDs.
4) Booting with the OSX CD in my USB optical drive and keeping D, C or alt keys didn't help.
I read in another forum that you could somehow copy the content of the OSX CD on a flash drive, then boot from the flash drive and conduct an AHT, but I'm not sure how it can be done.

Hi!
Looks like we posted at exactly the same time, Glynn! LOL
Anyway, I did just what you said, drag'n'drop and all. The problem is, when I boot from the USB hard drive, it's exactly as if I were booting from the CD: first I'm asked to choose a language, then the install screen appears, and I can either reinstall on my startup disk from the USB hard drive (that's kinda cool, but I don't think I leave in on my USB hard drive, which can only content 40Gb, because I've almost 25Gb worth of data to retransfer soon...
So, in a nutshell, I couldn't find Apple Hardware Test anywhere. I even explored the CD content, but there are so many files...
What's my best option now? Could AppleJack help me here? Can I install AHT on my startup disk and boot on it using a special set of keys?
Almost time to go to work. A 5 minute walk, though...

How to burn Apple Hardware Test with 10.7 bought on the App store

Hi Community,
My friend has a MacPro with 10.7 on it. He upgraded his OS by buying it on the App store.
Now he has a weird screen at start up
We would like to run Apple Hardware Test on the install DVD but as mentioned he bought it from the App store.
The only file we get is an installer (4.2 GB) but it is not a start up disk.
Has anyone an idea of what could be done ?
Thanks in advance for your help.
Denis

Apple Hardware Test can be invoked on Lion installations by holding D while starting from the internal HD. If that does not work try Option D as that will attempt to load an Internet version of AHT.
I do not know of a way to burn AHT alone to DVD, but the disc that originally shipped with his Mac Pro will have AHT on it. Booting from that disc while holding the D key will load the disc's version.

How to obtain apple hardware test for MacBook Pro (15-inch, Mid 2009), how to obtain apple hardware test for MacBook Pro (15-inch, Mid 2009)

I no longer have the software disk (OS10.5) that came with my MBP in July 2009. I only have the $10 Snow Leopard disk from Apple, which does NOT seem to contain any Apple Hardware Test (AHT). I have tried starting while holding d or option keys to no avail. Does neither my laptop nor OS 10.6 install disk have AHT? If not, can the appropriate AHT be obtained? My wife has an older MacBook & her original 10.5 install disk, but it will not launch AHT in my MBP. Any suggestions?
Thanx

I like the advice to contact Apple and simplky pay for a new AHT. I did that, giving them the serial number of my MBP and indicating it was a June 2009 model, 2.66 gHz Core 2. However .....
I received yet another Apple FedEx shipmet with yet another different Mac OS X Leopard install DVD; this makes three in all!! Just as with the 1st DVD, these two will NOT mount on my desktop, are NOT seen by Disk Utility (or by Drive Genius) and cannot boot my MBP laptop in either of 4 different modes: (1) start-up with "d" (2) start-up with "option d" (3) start-up with "option" (4) start-up with "c". Apparently none of the disks I received have Apple Hardware Test on them, although that is what I paid for in early December. It may be that the last two disks really do have Mac OS X Leopard on them, but because I am now running OS 10.7.5 (purchased from App store with no AHT), the disks cannot be seen by my laptop.
          The two most recent incorrect DVDs I received have the following part numbers:
                    SRF2Z691-6037-A [indicated on packing slip 10.5 Retail-International]
                    SRF2Z679-6341-A (indicated on packing slip 10.5.6 Retail (PCrly 09) In]
          I happen to have MacTracker app 7.2.1. It indicates that my laptop is a MacBookPro 5,3 model A1286 EMC2325 and requires Apple Hardware Test 3A171. Apple never sent me the correct AHT.
          I suspect that Apple's cost to ship 3 incorrect DVDs by 1- or 2-day FedEx vastly exceeds the $17.44 price I paid for a working version of AHT for my computer, but have yet to receive.

How to access Apple Hardware Test?

I just installed a fresh copy of Lion over Snow Leopard hoping that I woul be able to use the AHT but it just starts up like normal when I hold the D key... I've tried it a billion times. Anyway I can put the AHT on my iMac? It's an A1224.

When you upgrade OS X or you erase the hard drive, Apple Hardware Test stops being saved on the hard drive. If you want to run Apple Hardware Test, you have to insert the Mac OS X disc which came with your computer and start the computer holding the D key. Read > http://support.apple.com/kb/ht1509

MacMini 2010 4,1 how to run Apple Hardware Test from /System/Library/CoreServices/.diagnostics folder

I have a 2010 Mac Mini4,1 with SnowLeapard and plan to upgrade to Mavericks, but can't run Apple Hardware Test from my applications disk 2 that came with the machine. For some reason the Mac can read it and kicks it our after about a minute. Seems to be able to reado other disks, so this one may be corrupted. I found info on this community that says that the AHT is on the hard disk and I found it here /System/Library/CoreServices/.diagnostics using terminal. When open that folder using terminal it open a window with that folders contents. My problem is I can execute the only unix executable in that folder. It responds with "No application knows how to open /System/Library/CoreServices/.diagnostics/diags.efi"
Can someone help me out here or if there is downloadable somewhere on line that I can get?

My 2010 4,1 Mac Mini still has the HW Test on the Internal HD after updating it to Lion, Mountain Lion and Mavericks.
see > Using Apple Hardware Test
Additionally if your using a wireless keyboard and it is not invoking the Hardware Test using the D key immediately after the chine, then you may need to use a USB keyboard. Adding that any Apple, PC or generic Logitech USB keyboard should work for invoking the startup commands.

How to run Apple Hardware Test on Mac Pro with ML preinstalled?

I have Mac Pro 5.1 (2012) which came with Mountain Lion preinstalled. It didn't have install DVDs. How do I run AHD? Restarting with D, or command+D, or option+D didn't work. It would just restart the OS. And Mac Pro didn't support Internet AHD eather.

Thank you for your reply, Carolyn.
I read this article. None of those applied to my case:
my Mac Pro came before 2013 and it doesn't have Apple Diagnostics built into it,
it doesn't have Apple Hardware Test built into it,
and my Mac Pro came with Mountain Lion preinstalled and it did not have system software disc or USB flash drive.
Restarting while holding down the D key simply doesn't work it just reboot back to the desktop.

IMac intel late 2006, lost DVDs, how to run apple hardware test

Hello, Applers,
I have an iMac intel core 2 duo late 2006. I have upgraded it to snow leopard. From two months ago, it began to show distorted pictues, random lines/pixels/, and regular freezing. But if I boot it into the safe mode, it works well, although there is no sound or webcam. I did a research online and it seems that I should run apple hardware test (AHT) first. But the DVDs came withi this machines have been lost. where can I download this software? I would greatly appreciate your help if any of you who also have this model of machine and would like to lend me your DVDs.
any suggestions are welcome.

You can purchase replacements from AppleCare:
Apple Store Customer Service at 1-800-676-2775 or visit online Help for more information.
To contact product and tech support visit online support site.
There is no way to run the AHT without the discs.
If it works OK in safe mode then you might think about:
Resetting your Mac's PRAM and NVRAM
Intel-based Macs: Resetting the System Management Controller (SMC)
Reinstall Snow Leopard:
Reinstall OS X without erasing the drive
Do the following:
1. Repair the Hard Drive and Permissions
Boot from your Snow Leopard Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer.
If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
2. Reinstall Snow Leopard
If the drive is OK then quit DU and return to the installer. Proceed with reinstalling OS X. Note that the Snow Leopard installer will not erase your drive or disturb your files. After installing a fresh copy of OS X the installer will move your Home folder, third-party applications, support items, and network preferences into the newly installed system.
Download and install the Combo Updater for the version you prefer from support.apple.com/downloads/.

Apple Hardware Test problem on Mountain Lion

I;ve been trying to do the Apple Hardware Test with no success. I've tried holding down D and option-D yet nothing. My macbook just boots up as normal. It is recommended to download the EPI firmware upgrade fro Lion recovery. That one is just not compatible with my system and could not install it. What's next? Can I just download the AHT from somewhere?

It depends on what OS your mac shipped with. Which OS did it ship with?
http://support.apple.com/kb/ht1509

How to run apple hardware test with no cdrom?

My MacBook Air won't recognise old or new hard drive and I believe I may have a logic board issue. My external CDROM has also just stopped working due to the wire being split some. I have two questions, can I get a replacement wire for the CDROM and can I run Mac hardware test on my 2008 MacBook Air without a CDROM? I still have the original CD1. I am currently booting the mac from a Lion installation on an external HDD attached to the USB port.
If the answer to those is no, where can I sell this stuff for scrap?
Thanks

See this article

Apple Hardware Test

I just upgraded the ram in my new 2011 iMac and I want to run Apple Hardware Test. Since Apple no longer supplied a DVD with this bootable app I was wondering how I can launch the App. I tried apple's online doc and held the "d" key down to try to boot it from the internet but eventually the OS just launches instead. I then read that you are suppose to pess Command + D, same thing its a gray screen for a while but then eventually launches OSX. I even tried a bootable DVD of Snow Lepard and its not compatable. Please help. Id like to be able to run the hardware test.

Hello
Instructions tu use AHT from help menu
try use an ethernet cable , turn off airport ,restart your computer while holding down both the Option and “D” keys
Use Apple Hardware Test
Open the Help Viewer’s Action pop-up menu (looks like a gear) and choose Print to print these instructions.
Disconnect all external devices except the keyboard, mouse, display, and speakers. If you have an Ethernet cable or external DVD drive, disconnect them.
Restart your computer, holding down the “D” key while the computer restarts.After your computer restarts, you should see the Apple Hardware Test chooser screen. If you don’t, Apple Hardware Test may not be available on your computer. You may be able to start Apple Hardware Test from the Internet. Reconnect your computer to the network, and then restart your computer while holding down both the Option and “D” keys.
When the Apple Hardware Test chooser screen appears, select the language you want to use, and then press the Return key or click the right arrow button.
When the Apple Hardware Test main screen appears (after about 45 seconds), follow the onscreen instructions.

Apple Hardware Test, What is the Extended Test?

Hi. Using the Apple Hardware Test under disc 2 of the iMac's (late 2009) there's a checkbox for an extended test but it takes significantly longer compared to around 3 minutes only with a normal test. What does the extended test that the normal test have? Does it test more parts in the iMac?
Is there a third-party that's better than Apple Hardware Test that can test every bit of hardware in the iMac including it's power supply, internal battery charge, transistors, capacitors (if there are capacitors that are about to burst or are not delivering the proper voltage or current), if every pixek in the LCD is good, if the speakers are not torn, etc.
Gbu.

The extended AHT does a much more extensive set of tests on your RAM.
An alternative memory tester is Memtest which is a terminal command with Rember being a GUI layer for memtest.
There's also the diglloyd tools memorytester but it is not free.
AHT does video testing but I am not sure how extensive it is. And I'm pretty sure no utility exists to do component-level validation. Does such stuff like that exist for any piece of electronic equipment (TVs, radios)? That's what volt meters are for and possible test points on the pc boards.
I should add there are utilities like iStat Menus which are capable of displaying temperatures, volts, amps, watts of all many components of the hardware. But they just display the info, they aren't testing the stuff. It's up to the person looking at that info to decide if something is too hot, drawing too much current, etc.

Where is Mountain Lion's Apple Hardware Test?

Hi. My Snow Leopard DVDs which are in good condition won't read anymore after installing Lion and now Mountain Lion (the Superdrives' working properly as I can burn CDs and DVDs. The DVD does see it as blank with Untitled DVD but .iso Linux images for example boot when you restart it). Apple may have intentionally made the Superdrive not be able to read original disks to favor USB Flash drives and the Cloud I'm guessing which is fine by me coz' those can never be damaged physically or are less prone to physical damage.
But the Apple Hardware Test is in the Applications DVD of the Snow Leopard. How do I run Apple Hardware Test then on Mountain Lion? Any third-party app that goes beyond what Apple Hardware Test can do that you could recommend?
Thank you in advance.
God bless.

I don't understand why your system is not recognizing the SL install disk - it should. The timing of any key combo with a restart is difficult with a wireless keyboard - unless the timing is perfect, it won't work. As suggested, try /borrow a USB keyboard.
Another thing to try is to insert the SL install disk; then go to Startup Disk Pane in System Preferences and see if your SL disk is listed in the choices. If it is, then select it and hit restart.
As for the question re. the bootable USB stick/DVD, I have not tried that, so I cannot say if that would work or not. Does your Mac have internet recovery or did you install the firmware for it as outlined here:
http://support.apple.com/kb/HT4904
Having read all I could find about recovery, there is no mention of any Apple Hardware Test; not even here (which is quite comprehensive):
http://pondini.org/OSX/RecoveryHD.html
The only things mentioned are the options in Disk Utility. So, unless you can boot from your SL install disk and get to the test that way, I am stumped. My suggestion would be to book an appointment at your nearest Genius Bar (if you are past the warranty) or call Apple support if you're still covered.

How to start Apple Hardware Test under OS X Lion

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