Unable to launch Apple Diagnostics

Definitely try doing Option-D to see if you're able to load the diagnostics via the Internet.

How to use Apple Diagnostics on your Mac - Apple Support

(see footnote at the very bottom of the article)

That's good to know that an erase/reinstall won't even work. I did a reinstallation of macOS Mojave 10.14.4 which didn't work. What you wrote (presented in italics) happened to me too. The common denominator seems to be the update to macOS Mojave 10.14.4

"Mojave 10.14.4 does not boot to diagnostics with only the D key, just a white screen. Option D gives me the Error: 0x8000000000000003, Cannot Load 'EFI/Drivers/TestSupport.efi'

Status: 0x00000003"

Got the exact same issue here. Got an MB Pro Mid 2012 & Mid 2009, both running High Sierra via 'patching'. Can no longer access diagnostics on either of them - just get a blank screen with..... Error: 0x8000000000000003, Cannot Load 'EFI/Drivers/TestSupport.efi' Status: 0x00000003. Took the 2012 MB Pro to my local mac repair shop (not an Apple Store) and they couldn't figure it out either. Not sure the culprit is Mojave - as I'm still running High Sierra 10.13.6. It's all very weird though.

As you are convinced this is the issue (which I am also thinking in agreement with you) how can we go about reversing the firmware install? only way I have come across in my searches so far that looks like it would be a valid option is by booting the Mac on a linux OS, and using the linux OS to do a flashrom command set with the appropriate files for the MacBook Pro in question.

I would be very interested if you had any info as while this issue is not a game breaker YET having the option to run basic diagnostics is kind of desirable over having to put that function in the hands of someone else or an apple store anytime it needs to be done

thanks

MacHound wrote:

750+ is too small of a number for a global company to notice. 750,000 might get their attention, or maybe not.

I don't know where the 750+ number comes from (this thread says 443), but in any case Apple does not monitor these discussions. If you want to bring something to Apple's attention, you must do so proactively. The way to do that is to take your Mac to an Apple Store Genius Bar or an AASP (Apple Authorized Service Provider – note that Best Buy stores are now AASPs), and show them the problem. If your Mac passes their in-house hardware test, then you have a case and can ask them to fix this problem, or tell you how to fix it. If your Mac doesn't pass their test, you'll have to get it repaired before they'll listen to you about this problem.

So far as I know, nobody here has done this. (I haven't due to chronic illness which severely limits my activity.) Complaining here may provide some satisfaction, but does nothing to solve the problem. And it's certainly been established by now that none of us can solve it; it has to be done by Apple.

See my previous (lengthy) posts in this thread for more details.

Ah yes, MBP 2012 needs an ASD, it's pre-internet HWD, might ask for other clues on my site...

https://x704.net/bbs/

I encounter the same problem.

And it's sure Mojave causes that.

Safeboot or Downgrading macOS doesn't work.

We should wait Apple fixes the bug.

https://discussionsjapan.apple.com/thread/250264452

An alternative test to determine the viability our HDs would be helpful in ascertaining the problem. If our HDs are healthy, then we pretty much know that it's a firmware problem related to updating.

Other HW tests include TechTool Pro & SpeedTools Utilities Pro...

No guaranty on how the Disk Tools workm with APFS though.

What are your concerns?

macOS Mojave - Technical Specifications

General Requirements

• OS X 10.8 or later
• 2GB of memory
• 12.5GB of available storage (OS X El Capitan 10.11.5 or later)*
• Some features require an Apple ID; terms apply.
• Some features require a compatible Internet service provider; fees may apply.

Mac Hardware Requirements

For details about your Mac model, click the Apple icon at the top left of your screen and choose About This Mac. These Mac models are compatible with macOS Mojave:

• MacBook (Early 2015 or newer)
• MacBook Air (Mid 2012 or newer)
• MacBook Pro (Mid 2012 or newer)
• Mac mini (Late 2012 or newer)
• iMac (Late 2012 or newer)
• iMac Pro (2017)
• Mac Pro (Late 2013; Mid 2010 and Mid 2012 models with recommended Metal-capable graphics cards)

https://support.apple.com/kb/SP777?locale=en_US

My 2012 iMac running Mojave 10.14.4 does not boot to diagnostics with only the D key, just a white screen. Option D gives me the Error: 0x8000000000000003, Cannot Load 'EFI/Drivers/TestSupport.efi'

Status: 0x00000003

I have even done an erase and reinstall, an Apple Senior Advisor said it was a firmware issue and that a erase and reinstall would fix the issue, but it did not. Prior to contacting apple I did all the troubleshooting possible. I am considering requesting that engineering take a look at this. I have seen on other sites that it could be the memory/RAM about to fail, but before going in for a repair (it's vintage, I know, I would have to go to a 3rd party, and I do have one) I just want to confirm that is really what is going on.

Any other ideas?

I got the same problem after upgrading to mojave, everything got deleted And now my macbook pro 15 early 2013 stuck on os x 10.8.5, cannot upgrade to any OSes. I have asked for help from the genius bar, and they didn’t put effort into finding out this problem at all. So sad

I'm having the exact problem. I was able to conduct an Apple Diagnostics Test in December 2018 (hardware passed after running full test), but after several updates to the current—as of April 2019—macOS Mojave 10.14.4, I decided to run another test in April 2019 and received the same error and status messages as you

(Error: 0x8000000000000003, Cannot Load 'EFI/Drivers/TestSupport.efi'

Status: 0x00000003).

I did a reinstallation of macOS Mojave 10.14.4, but no joy.