MacBook Pro (Mid 2012) can't finish Apple Diagnostics Testing

Well, I have a similar issue, I can't get AHT on the screen. not with D nor with Option D.

And the folder '/System/Library/CoreServices/.diagnostics' does not exist.

Can I download AHT and use it on an usb-stick?

A Mid-2012 MacBook Pro cannot run the newer Apple Diagnostics. Instead, it would use the Apple Hardware Test for this purpose. Macs that were made between post 2010 and pre-June 2013 normally run AHT from code which is hidden away in /System/Library/CoreServices/.diagnostics, which often seems to get wiped and not restored when you replace the internal storage, or perform a clean re-install. Not knowing if you had done either of these could be the reason you are seeing this error.

The "/EFI/Drivers/TestSupport.efi" is not referencing anything on your computer's physical drive. It is actually referencing files on a virtual volume downloaded from the Apple servers or the actual files on the Apple server.

Have you tried both holding down the <D> key, and <Option><D>? The latter would attempt to download the AHT from the Apple servers. The message you see could be indicating that your Mac is having trouble contacting those servers.

Try using a wired USB keyboard & mouse to see if you can type and navigate properly.

To look for possible software issues run EtreCheck and give EtreCheck "Full Disk Access" which will provide more information including a summary of the recent logs which may provide more clues.

To check the health of the drive(s), run DriveDx and post the complete report for each drive.

Post both reports here using the "Additional Text" icon which looks like a piece of paper.

Tesserax wrote:

A Mid-2012 MacBook Pro cannot run the newer Apple Diagnostics. Instead, it would use the Apple Hardware Test for this purpose. Macs that were made between post 2010 and pre-June 2013 normally run AHT from code which is hidden away in /System/Library/CoreServices/.diagnostics, which often seems to get wiped and not restored when you replace the internal storage, or perform a clean re-install. Not knowing if you had done either of these could be the reason you are seeing this error.

With a system firmware update included in macOS 10.12.x and 10.13, these older Macs from 2010+ were given the ability to boot to the online Apple Diagnostics and Internet Recovery Mode. Unfortunately some of the system firmware updates are incompatible with the bootloader files for some of the network resources. For consumers, this means the Apple Diagnostics (both online and offline). Unfortunately this is something Apple broke and has decided not to fix. The fix would require Apple to fix the broken "EFI/Drivers/TestSupport.efi" boot file in the virtual diagnostic package. We had other similar boot issues for other services which Apple later fixed with new boot files compatible with the new firmware, but Apple only fixed what they felt like fixing plus we waited for some of the fixes for over a year.

Some of our organization's 2012 laptops will boot the online diagnostics while others will not. I haven't had any time to document them to figure out which firmware works and which does not. Or perhaps there is another unknown item in the mix which may be similar to the issue where some Macs won't boot into the proper online macOS installer and will instead default to booting the online macOS installer which originally shipped on the Mac from the factory regardless of the keys used to access Internet Recovery Mode.

Unfortunately there is nothing the user can do to fix this problem. Most likely the user would be unable to even boot the older offline Apple Diagnostics available from this Github page (all the diagnostics are actually downloaded directly from an Apple server, the Github page just collects the links and provides instructions).

@SamSLP, what issues are you having with this laptop other than not being able to run the diagnostics? There are other ways to troubleshoot system issues.