2018 Mac Mini - monitor problems

Upgrading to 10.14.6 will stop this incredible MacMini problem?! ... Finally the long-awaited news? Let's hope!

If it's still in warranty, I would upgrade ASAP in case anything goes wrong, so you can take advantage of the warranty service (if needed).

 After the update on Catalina, there was the same problem. The monitor does not go out of sleep mode or simply does not turn on when rebooting.

Catalina 10.15.

LG 27UK650-W

Send it back!!!!!! Don't wait! I got mine on 8/1/19 and they will not let me get a refund because it has been longer than 30 days!

In my case nothing change after update to 10.15.2 ... Setup is HDMI -> DVI-D cable, monitor LG E2342.. On start show "out of range" after boot need to plug and unplug to start work normally..

Nothing change after update to 10.15.3.. The problem is the same...HDMI to DVI need plug unplug to start working normally.

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.

After update and reset SMC.

This monitor works with all my 3-pc, but not mac mini.

Lets all of us upload videos of f*cking issue....

https://www.youtube.com/watch?v=09LDqlTZta8

In Systems Preferences > Displays > Display you can option-click on Scaled to get a list of alternative resolutions like 2560x1440.

Is this identical to the problem I have. I have the Mac mini 2018 (2 days old) hooked up to a LG34WK95U. When I switch my Mini on, I see my monitor coming awake and then after a few seconds it says no signal and entering power saving mode.

When disconnecting the thunderbolt 3 cable and reconnecting again moist of the times I suddenly have a picture on my screen. Also forcing Mac mini off and then rebooting it sometimes restores the connection.

Is this the same known issue and under investigation?

Thanks, hope this will be fixed soon!

Doesn't help that the DisplayPort subsystem seems deeply flawed. HDMI seems to get around that if you get a high-speed cable. HDMI 2.0 is probably needed; my monitor's only got HDMI 1.2, which I think is turning into a problem.

The problems I've been having occur with either HDMI or DisplayPort, but don't affect my old monitor.

I have a similar issue. Very often when the 2018 Mini (10.14.3) wakes from sleep the monitor just displays a fuzzy screen. Turning the monitor off and on again resolves the issue, but that seems like rather an old-fashioned approach. The monitor is a Dell HD IPS panel model U2211H. The connection is via Apple's HDMI to DVI cable. It previously was hooked up to a 2009 MacBook via Apple's Displayport to DVI cable and I never had the problem.

I'm having the same problem. No video is sent to my dual NEC PA271Q monitor setup through a single USB-C (Thunderbolt 3) connection. The monitor reports no video when the computer boots up, then goes dark, but is obviously getting a signal for things like the monitor's USB hub, etc. When I wake computer, from sleep mode, all is working correctly and monitors come to life.

Equipment:

2018 Mac Mini (optioned out)

Dual NEC PA271Q monitors connected with single (short) USB-C cable directly from Mac Mini and daisy chained with display port cable to second monitor

Mac OS 10.14.3

I’m sure Apple will delete this comment. But I had my Mac mini for two months and just sold it on eBay. I’m over the non help and the non admission of a problem. This display thing is a huge problem and I highly doubt Apple will fix it so I sold mine.

March 27 2019

After upgrading my Mac Mini to OS 10.14.4, and then shut down, the mac will not boot up at all. No screens show anything. This repeats itself after juggling usb cables, slimming down to one only monitor, removing all external hard drives, etc.

The blue light goes on, the machine sites there with blank screens for a few minutes, and then the mini self shuts down (blue light goes off).

10.14.4 is no fix... it has made the problem worse.