Yesterday, I tried to install the High Sierra Security Update 2019-002 on my 2012 Mac Pro (DP W3680 3.33 GHz processors). I used the standalone installer. After launching the installer and authorizing it, I clicked to restart and complete the installation. The screen went black except for the arrow cursor and nothing happened. After four hours, I pressed the power button to do a hard reset. I've never had problems prior to this, doing any updates, even those that contained EFI ROM (firmware) updates.
For comparison, I did the same procedure on my 2011 17" MacBook Pro. Its screen went black briefly (with the same cursor), then a whitish screen appeared and the installation began. It went through a few restarts for the security update and firmware update and finished everything just fine.
When I tried to power on my Mac Pro, a whitish screen appeared after the normal startup chime, so I guess memory and other HW checks were okay. A bunch of white text in a black background then appeared on the whitish display, in a way that happens (I believe) when starting up in verbose mode. The Mac then sat in that state for up to 3 hours without any further progress. I did two a few attempts at resetting the NVRAM ("PRAM") and unplugged the Mac to reset the SMC, both to no avail. Here is the text that displays on every attempt to boot the Mac:
[0 0 ] start port.
[0 0 ] start port hard reset (probe 1).
[0 1 ] start port.
[0 1 ] start port hard reset (probe 1).
[0 2 ] start port.
[0 2 ] start port hard reset (probe 1).
[0 3 ] start port.
[0 3 ] start port hard reset (probe 1).
[0 0 ] failed to hard reset.
[0 0 ] failed to perform port hard reset.
[0 1 ] failed to hard reset.
[0 1 ] failed to perform port hard reset.
[0 2 ] failed to hard reset.
[0 2 ] failed to perform port hard reset.
[0 3 ] failed to hard reset.
[0 3 ] failed to perform port hard reset.
I do have an EFI flashed NVIDIA Titan X (from macvidcards.com) display card installed. I've never had problems with OS or firmware updates before with the card installed.
I couldn't find any info in a few web searches about the text displayed on my Mac's screen. I did find a nice article by Howard Oakley on his Eclectic Light website (eclecticlight.co) about EFI boot issues, startup chimes, etc.:
Startup tones, EFI, and fixing failed firmware updates
From the article, I found info on Apple's website and downloaded a "Firmware Restoration CD 1.9" disk image and burned it to a CD. However, I couldn't get the CD tray to eject on system boot, whether I used keyboard shortcuts or held a mouse button depressed. I'm not even sure if the CD/DVD drive is "active" at the point I reached when trying to boot my Mac Pro.
Right now, I'm a bit at a loss to know how best to proceed. If anyone knows about the screen text I listed above and what it means, that info may be very useful. I may try putting in an old, GT8800 Apple-supported display card to see if the EFI-flashed Titan X card is causing the Mac Pro to balk... and then try booting the Mac Pro (with the older GPU), doing the updates, then re-install the Titan X card...
I was wondering if anyone might have seen this behavior or has some advice for how to proceed... I would appreciate any thoughts or suggestions.
Thanks!
P.S. Just a wild thought, but since the screen text I listed above seems to be info about a set of 4 things, it may suggest that those messages are related to the PCIe slots...?
P.P.S. Sorry, but I forgot to mention that I did try booting into recovery mode, verbose mode, single-user mode, etc., without any success...