Unable to launch Apple Diagnostics

Incidentally I spent a good half an hour back and frothing with an apple rep on live chat, who first suggested an os clean install of Mojave (which I highlighted by linking here seems that no OS install will revert firmware) so was then told to go to a Mac shop for further help (ie to be told hmmmm we don't know how to fix this, but this shiny new Mac will work fine, and only cost 2 grand)

I have the same problem. I booted with the D-key down, and got a white screen. Then with option-D, and got

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

Status: 0x00000003

This stayed on the screen for minutes, and then the normal startup resumed. About This Mac gives:

macOS Mojave

Version 10.14.4

iMac (21.5-inch, Late 2012)

(etc.)

Software Update: Your Mac is up to date — macOS Mojave 10.14.4

Are we sure it's a Mojave problem?

I have the same issue and it started a month ago when I was still using Sierra OS.

Now I've upgraded to Mojave and the problem is still there.

The system is running normally, except for the Diagnostics issue.

Forgive my ignorance in the subject, but if the BootROM is screwed what does it imply? Any security issue?

Well for a start if it is boot ROM issue THERE IS WAYS to revert but I think none of the methods to do so, can be done within the Mac ecosystem if your boot rom install happens successfully (as from what I read, intel Macs that install firmware without an issue null any outdated install, like a version check and, if boot ROM= bootable, then installer of old boot rom version = denied)

It looks like it might be the case that having the necessary files on a linux bootable OS drive can be used to force write to the flash rom (Advanced level system flashing, can be dangerous) but to do this and not brick your Mac will also be a large risk, with factors to consider such as ensuring you have your system running a specific OS version and only flashing a 100% guaranteed compatible boot rom file.

It is all risk though and it is something I feel that due to the core nature in which this boot rom has borked so many MACs Apple Hardware Test access that a fix should really com from Mac, but to get it will require pressure from all affected users (due to the nature of many users, many people probably have this issue and don't even know ie, not very technical and have never even really used boot to AHT mode or anything like that)

My 2013 Mac Pro 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'm having the same issue on my late-2012 27" iMac.

The Mac had been doing a whole bunch of issues lately, decided to run diagnostics but it's impossible (either regular or network based).

Regular diagnostics just never boots, Mac is stuck a white screen.

Network diagnostics returns the following error (after showing a spinning globe for a while):

Error: 0x8000000000000003, Cannot load 'EFI/Drivers/TestSupport.efi'
Status: 0x000000003


It is not your memory failing, do not take that line because it ends with you buying either replacement memory from somewhere (which won't fix it) or them convincing you a Mac upgrade is due (its not :P )

Updated my MacBook Pro Mid 2012 (SSD + 16 GB RAM) to Mac OS Mohave 10.14.4 with the buggy boot rom. After the update second RAM slot does not work -3 beeps on start up when the second slot has RAM in it. Has anyone experienced the same problem or did my RAM slot just decide to die ? Same error when booting into hardware test.

Hi All

updated my MacBook Pro mid 2012(SSD + 2x 8GB RAM sticks) to Mac OS Mohave 10.14.4 with buggy firmware . After the update the bottom RAM slot stop working , causing the Mac to beep 3 times upon startup. Anyone experienced the same issue or has my RAM slot just died. Same error when trying to access the AHT. Thanks.

I am having the same issue as everyone else.

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

Status: 0x00000003

Using "D" and Option "D" at start up and attempting to log into my network. Once I put in the password, it goes back to the network screen and then the error screen appears. If I have an ethernet cable plugged in, it will go directly to the error mentioned above.

I have also submitted a bug report via https://www.apple.com/feedback/macos.html

Hi everyone. I came across this thread and it seems relevant to my problems with my Late 2012 27" iMac not booting (and not letting me install, run diagnostics tests etc)...

Ok... I'll try and keep this concise:

Late 2012 3.4Ghz 8MB iMac worked great for years - started to get some random restarts last year - was running High Sierra

Tried an update to Mojave - failed - and iMac no-longer would boot / kept power re-cycling

Took it in for repair at good authorized Apple repair center. They managed to get all data off the Fusion drive (128GB original SSD/NVME + 1TB HDD). They tried reinstalling OS (I think they put original Snow Leopard on there). But kept getting re-boots.

Told me it was likely a Logic Board fault which would cost $800 or I could leave with them for recycling...

I decided I wanted to try and save the machine - I had read that the PSU boards on late 2012 iMacs often caused this sort of problem - so I brought the iMac home - learned how to open it up (iFixit) - bought a refurbished different PSU board for $100 and fitted it.

Did a quick test - and it booted ! hurrah.

At this point I thought I would give the machine a bit of boost so bought a 1TB SSD (Samsung EVO 860) and swapped out the HDD for the SSD. I expected this to kill the fusion drive setup - and it did - but I was ready to install Mojave from external USB disk I had made

This didn't seem to work - but when I tried Recovery mode from Internet, It remade fusion drive, installed High Sierra - and booted! So was super happy, re-sealed screen to machine and had a working iMac again.

So then... I tried installing Mojave again (10.14.4)... seemed ok to begin with then crash... then didn't boot

wouldn't even get to disk utilities or Terminal with my Mojave USB install disk

So I thought maybe the fusion disk setup was the culprit - and therefore if I could reset that - maybe unfuse the drives and install OS X to NVME and use the 1TB for applications and user data...

I bought a firewire cable (and a new Mac book Air....) and used Target Disc Mode - I could see drives - I ran first aid on them - no errors. I tried lots of different boot options - in the end I erased them both to try and get rid of fusion setup (pic is before erase).

Everything I did hasn't helped getting past a stuck progress bar on the Apple Logo.

I can't do internet recovery, USB recovering, Paragon Hard Disk Manager USB Key, Apple diagnostics (via internet) - I get same error about Can't load EFI...

So then I thought if its nothing to do with my internal drives (which should be blank) - maybe its my memory... so I tried removing one 4GB bank - same results. tried other... same results...

The only thing I can get into is Single User Mode - but not sure what to do there to help....

Before I start believing it is a logic board problem I really want to rule out some kind of SW/Firmware issue - or test HW somehow and check it works - but remember - I have NO OS installed at the moment

Any advice really appreciated.

Thanks

Can't run diagnostics

from the earlier posts I thought going back from 10.14.4 was not helping? If I want to try 10.13.6 how should I make such a USB installer please?

BTW - things are getting worse - now I can't even see the drives in Target Disk Mode :( - the host is showing Firewire symbol - but no driver appearing on my iMac (which I just upgraded to 10.14.5 - hope that hasn't caused that). If I use Single User Mode (with as USB 10.14.4 key in) I see the drives are there - but I don't seem to be able to run fsck on them (only the USB 'root')

What do I need to to in Single User Mode to be able to a) check other drives, b) see them in Target Disk Mode please?

Hello,

If you have:

An Apple Hardware Test CD:Start up from it as you would any other bootable disc:

Then:

1.Insert the Apple Hardware Test disc that came with your Mac into your Mac's optical drive.2.Restart your Mac by either:

• Selecting Restart in the Apple menu.
• Pressing the Command-Control-Eject keyboard shortcut.

3.Immediately press and hold the C key on your keyboard.4.Release the C key after the Apple Hardware Test appears on your display and indicates that it is loading

http://www.thexlab.com/faqs/aht.html