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Use hardware test mode directly on latest MacBook pro Laptop Macs
On my 15" MacBook Pro (2.4GHz Penryn, February 2008), I've found I can boot into the hardware test mode without having the hardware test disc in the machine. If I press F2 before the startup bell, the machine directly enters hardware test mode. I don't know if this works with MacBooks or iMacs, however.

[robg adds: This doesn't work on my older MacBook Pro. I know that you can press 'D' at startup on the MacBook Air to get into hardware test mode, but this is the first I've heard of it on other models. (Any model should boot into hardware test mode by holding 'D' at boot with the install disc in the optical drive.) If someone else can confirm the no-disc-required behavior on a newer MacBook Pro (or other Mac), please post in the comments.]
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Use hardware test mode directly on latest MacBook pro
Authored by: solitario on Jun 17, '08 07:45:46AM

Last saturday I bought an iMac at the iCentre in Haarlem. The engineer who upgraded the memory told me that all recent macs can boot diagnostics directly without the installation media. Apparently it's been included in the EFI loader.



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Use hardware test mode directly on latest MacBook pro
Authored by: wallybear on Jun 17, '08 08:27:44AM

All new Macs have Hardware Test embedded in EFI.
If you install an old rEFIt you will see these additional partitions for every drive you have the system on (in newer rEFIt you can show them pressing F2); non need of the system disk inserted.



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Use hardware test mode directly on latest MacBook pro
Authored by: MtnBiker on Jun 17, '08 08:49:13AM

Confirmed on a new MacBook 4,1.

---
Hermosa Beach, CA USA



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Use hardware test mode directly on latest MacBook pro
Authored by: conigs on Jun 17, '08 09:03:41AM

Also confirmed on the slightly older Macbook 3,1



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Use hardware test mode directly on latest MacBook pro
Authored by: asmeurer on Jun 17, '08 09:08:54AM

I knew you could do this with iMacs, but I could have swore that I remember reading that you needed a CD for my new MacBook Pro. I will try this later.



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Use hardware test mode directly on latest MacBook pro
Authored by: asmeurer on Jun 17, '08 07:16:32PM

Yep. It works without the CD, but the CD that came with my computer has a hardware test too. Ideally, one would want to run the one from the system if possible because Apple could potentially update it via software update.

The fact that this is on the hard drive is surprising to me. I assumed that they had it coded into frimware, or whatever it is called for Intel Macs.



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Use hardware test mode directly on latest MacBook pro
Authored by: fitzage on Jun 17, '08 11:13:07AM

Does not work on MacBook Air.



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Use hardware test mode directly on latest MacBook pro
Authored by: DanFrakes on Jun 17, '08 12:44:22PM

As Rob mentioned, on the MacBook Air you hold down the D key at startup.

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Dan Frakes / Senior Editor, Macworld



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The AHT is embedded in the /System folder
Authored by: GaelicWizard on Jun 17, '08 01:15:05PM

If you take a look in /System/Library/CoreServices/.diagnostics you'll find the entire Apple Hardware Test installation. When you hold down 'D', the system looks for an EFI boot-loader that calls itself a diagnostic disc. If checks the optical drive first, and then the hard drives.

Its not embedded in the EFI itself. Its also not on another partition on your drive. Its just a folder in your /System folder.

Please Note: the .diagnostics folder will only exist if you are running the Mac OS X installation that came with your machine. If you have ever done an Erase & Install off a retail disc, then you will NOT have the .diagnostics folder.

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Pell



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The AHT is embedded in the /System folder
Authored by: DoctorJ on Mar 21, '09 04:02:49PM

Q1) Is it the case that newer machines no longer come with a optical test disc?

Q2) Are the diagnostic tools not available anywhere on the install disc?

If the answers are both no, what is a user supposed to do when it is time to replace the hard drive?

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Using a rusty Amiga 4000T & a shiny Mac PowerBook G4



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Use hardware test mode directly on latest MacBook pro
Authored by: n5tkn1 on Jun 17, '08 09:31:22PM

I see the .diagnostics folder exists on my iMac (2.4Ghz Duo). Will it be on my MacBook Pro? Its the version that came out right before the LED Macbook Pro. Also, will it be on my 2xdual core Xeon Mac Pro? (neither are by me at the moment.)

Thanks,,,



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Use hardware test mode directly on latest MacBook pro
Authored by: mjs13 on Jun 18, '08 03:43:06AM
This working because Apple Hardware Test (AHT) is on some modern macs installed in the 200 MB EFI partition. If you reformat your disk the EFI partition is wiped, and it will not work anymore.

I have seen it working on all Aluminium iMac's and MacBook Air (which is the only one where Apple refers to this behaviour in the documentation) I expect it to be working on most newer models since the Alu iMac.

If you want to see the EFI partition, run diskutil list in the terminal

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Use hardware test mode directly on latest MacBook pro
Authored by: ghay on Jun 18, '08 05:58:33AM

Does this mean as long as you put something bootable into /system/Library/CoreServices/.diagnostics hold D will let it boot at startup?



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