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Black screen after installing 10.14.6 Security Update 2020-002

Oculus Mentis

Oculus Mentis

macrumors regular
Original poster
Sep 26, 2018
144
163
UK
Hi, I have a 2018 Mac Mini running on Mojave 10.14.6 and using an Apple 30” Cinema Display via a DVI to mini display port to USBc adapter that has worked fine since I bought the mini in October 2018.

This morning I got a black screen after installing Mojave 10.14.6 Security Update 2020-002. I tried to power off and on again the mini via the power button but no joy. The only feedback I get is the front panel led that is on. When the mini powers up I no longer get the chime but this was also happening before this update.

Has anyone had similar issueS? I’m working from home during this Coronavirus outbreak and truly stuck with another sloppy and poorly tested update from Apple...
 
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Hi, I have a MacBook Pro 2018 15". I was running macOS Catalina and updated to version 10.15.4.
I have the same problem, black screen (no signal to be on), no sound when connecting the charger, no signal pressing the power button. Over the phone, I tried the procedures to reset SMC and NVRAM, but without success.

Any news in your case?
 
Hello there y'all. In my case I did not even upgraded macOS and I'm still running Mojave 10.14.6 (18G4032). I installed the security updates Apple released yesterday and now before I login i get a 100% backlit keyboard and the touch bar is completely shut down and unresponsive. This only happens if file vault is active. Similar issues happened in the past (see
https://www.reddit.com/r/MacOS/comments/bahuvx
and https://forums.macrumors.com/threads/keyboard-backlight-on-boot-up-file-vault-and-t2.2158391/). But when I contacted the support no one could tell me anything about it or find the reason why this happens. I just know it was not like this before.

As to Catalina Idk but I am quite sure I have issues with both my i9 processor and the T2 security chip in my MBP 2018. In fact I have an old MB air 2013 and the new updates run smoothly on it (possibly because there are less functionalities available and Apple can get that together). Hope we will start a influencing thread and push Apple to go back to the SW simplicity and consistency we all love...I feel more comfortable using Arch linux lately after I put it aside to speed up some parts of my work).

Hope you are all doing great and have a good one.

Take care,
M
 
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Had exactly the same issue today. Fixed by resetting the SMC.

Power off. Remove power cord from the Mac for 15 seconds. Plug it back in and wait 5 seconds. Then turn it on.

That got it back for me.

Wayne
 
Oculus Mentis said:
Hi, I have a 2018 Mac Mini running on Mojave 10.14.6 and using an Apple 30” Cinema Display via a DVI to mini display port to USBc adapter that has worked fine since I bought the mini in October 2018.

This morning I got a black screen after installing Mojave 10.14.6 Security Update 2020-002. I tried to power off and on again the mini via the power button but no joy. The only feedback I get is the front panel led that is on. When the mini powers up I no longer get the chime but this was also happening before this update.

Has anyone had similar issueS? I’m working from home during this Coronavirus outbreak and truly stuck with another sloppy and poorly tested update from Apple...
Click to expand...


Yes me too same thing happened to me. Not the display since I have two and both are doing this!
 
I have a Black screen on my 2nd monitor after installing 10.14.6 Security Update 2020-002. I am running a MB Pro 2018 2.6 GHz 16G RAM. My Radeon Pro does NOT SHOW UP About this Mac until you dig down deep to graphics/displays. Everything was running fine until I did the update this morning. I checked all connections, unplugged replugged everything. I Zapped the PRAM, I reset the SMC. Blac 2nd screen. This is unacceptable Apple! Anybody have any ideas?
 
no-names-left said:
I Zapped the PRAM, I reset the SMC. Blac 2nd screen. This is unacceptable Apple! Anybody have any ideas?
Click to expand...

I had to do the unplug video cable / unplug monitor power cable / factory reset monitor / SMC reset / NVRAM reset dance a few times before my mac mini displays woke up after most recent update - but so far have continued working
 
djc6 said:
I had to do the unplug video cable / unplug monitor power cable / factory reset monitor / SMC reset / NVRAM reset dance a few times before my mac mini displays woke up after most recent update - but so far have continued working
Click to expand...
I chatted with Apple briefly and they had me boot in Safe Mode. They said that often resets issues like this. Well It didn't fix anything... but what i did find is that one of my Thunderbolt ports is no longer working. It was fine before the update. I moved my mouse with a single USBC adapter around all the ports and found one apparently dead. I then moved my monitor adapter to another port and it worked. I then tested the "dead" port to see if the power cord would work there. It does. So it will input, but no output. A mouse I believe is bidirectional, so that's why it wouldn't work? My theory. So the update killed a port. Interestingly, the Radeon Pro card DOES appear in my "About My Mac" screen again - I think the Safe Mode boot fixed that. I was given a local Apple authorized repair place so I can go in and brave the COVID world to get the port fixed.
 
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Ok not sure how this helped the issue but I plugged in an HDMI monitor to the USB-C port that I was using for the cinema display VGA adapter and the new monitored worked. I had read above where that the port might be screwed up by the update, thank you no-names-left, so I went back and tried the cinema display VGA adapter again in that port where I had the HDMI previously plugged into and the cinema display started to work! Not sure what happened, but it works now.
 
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