Cinema display stopped working MacOS 10.14.4 upgrade


lloyd2012

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Hi,

hoping someone might be able to give some advice or point me in the right direction to try to sort this out.

I have a Cinema Display 20in (Aluminium) connected to a 2018 Mac mini, using a DVI to HDMI adapter.

The display was working fine until I upgraded from 10.14.3 to 10.14.4 yesterday.

Now on starting the computer up, I get a snow storm after the computer boots from apple progress logo to login screen. If I unplug and plug the HDMI adapter the display returns to normal.

Can anyone help?

Many thanks,

Ollie
 
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Cory Cooper

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Hello and welcome.

A few troubleshooting questions for you:
-What brand/model is the DVI to HDMI adapter?
-Have you tried and SMC and NVRAM reset?

I have seen this before, and it can be a few things: loose connection, failing adapter, resets above need done, etc.

C
 

lloyd2012

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Thanks for the suggestions Cory.

I've reset SMC & NVRAM but it has not resolved the problem. Infact I now get a pink line down left side of screen on boot up before it goes to snow storm. Again unplugging and plugging back in the HDMI adapter after boot up resolves the issue completely. There are not any loose connections.

Adapter is only a few months old and has not had rough treatment at all. Bought off amazon - it's a Startech.com 8in HDMI to DIV-D video adapter. Not a brand I recognised but looked better quality than the other cheaper things on amazon and was the "amazon's choice".

I'm thinking it seems a bit strange for it be the adapter failing, if just unplugging and plugging it back in once computer is up resolves the issue completely?

Ollie
 

Cory Cooper

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No worries.

It actually could be the adapter or HDMI cable. Usually, StarTech products are fairly good, as we use hundreds of them at my work. They do randomly fail, obviously when mishandled, but sometime out of the blue with no signs of wear.

Maybe applying the macOS Mojave 10.14.4 Combo Update over the top of your installation might help. As always, make sure you have a current Time Machine or other backup before updating the OS.

C
 

lloyd2012

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Unfortunately applying the combo update has not helped either.

I may try a complete reinstall before buying a new adapter. I hear others have had problems as well with the 10.14.4 update

Thanks for your help.
 

Cory Cooper

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Normally, applying the combo updater is mostly the same as a full reinstall for most issues. However, it might correct the issue.

Let us know how it goes.

C
 

lloyd2012

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I can confirm that for me, it was the 10.14.4 update that was the problem. I performed a complete clean install with 10.14.3 and it is now working again.

Interestingly when I looked at the automatic 10.14.4 update description again, it says it is meant to fix some external displays having problems connecting to Mac mini 2018, not break them.

This is the first time in over 15 years of using macs that an update has actually “broken” things.
 
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lloyd2012

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Bit irritating as it means I can’t update my Mac now unless I want to plug/unplug monitor everytime
 

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