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Jez2007 Author

Level 1

56 points

2018 Mac Mini - monitor problems

I have a new 2018 Mac Mini (running OS 10.14.2) which is connected to a LG 24UD58 monitor via a USB3 to DisplayPort cable.

When I shut down the Mac and then try to start it up again, the monitor is blank and does not appear to be receiving a signal from the Mac. I had the same problem when using another monitor (my old Dell U2312HM) using the DisplayPort cable.

When I connect both monitors (the LG via Display Port; the Dell via an HDMI), I am able to shut the Mac down and then start it up again, with both monitors working.

There are other users with similar problems.

Is there any fix?

many thanks

Mac mini 2018 or later

Posted on Dec 21, 2018 10:12 AM

455 replies

Feb 22, 2020 2:42 AM in response to jnoxon

I think is SMC bug. APPLE PLEASE FIX IT !!!

Feb 26, 2020 1:04 PM in response to Jez2007

This is a gigantic problem for me too; but expecting Apple to fix this bug is beyond naive. They're too busy now doing new animojis.

cpmax

Level 1

14 points

Mar 13, 2020 8:16 AM in response to Davert

I was just told by support that the HDMI issue has been fixed in 10.15.4 which should be released shortly.

We shall see.

cpmax

Level 1

14 points

Mar 21, 2020 10:35 AM in response to nickstock

What version of the beta? I installed version 6 and it didn't fix my issue.

cpmax

Level 1

14 points

Mar 22, 2020 9:39 AM in response to nickstock

I have the same build but I have the i7 version of the Mini. How could something like this take so long to fix? Unless, it's a hardware defect.

cpmax

Level 1

14 points

Mar 22, 2020 9:46 AM in response to Davert

We need a popular tech youtuber to replicate the issues. That would bring some attention to it.

Mar 22, 2020 10:49 AM in response to cpmax

I wait cable from aliexpress usb-c to dvi-d, my last hope to work normally. Mac mini is so problematic device.

jnoxon

Level 1

4 points

Mar 24, 2020 12:05 PM in response to nickstock

The final release of 10.15.4 is out, and it does not solve the issue. The hardware workaround (HDMI audio insertion device) still works. Very disappointing.

Davert

Level 1

12 points

Mar 24, 2020 12:06 PM in response to jnoxon

I'll go one step further: it screwed up my working system (not 10.15.4 but the update to 14.whatever). However, an SMC reset fixed it. After I recovered from the SMC reset. [sigh]

Mar 24, 2020 12:08 PM in response to jnoxon

It worked for me. Do an SMC reset.

jnoxon

Level 1

4 points

Mar 24, 2020 12:39 PM in response to nickstock

SMC reset did not work for me. I followed the T2 desktop procedure - shut down, unplug 15 seconds, plug back in, wait 5 seconds, power on. Tried it twice with no change in outcome.