No HDMI signal on Mac Mini after reboot or wake up with High Sierra

Unplugging HDMI cable and reconnecting it while the Mac was stil on magically solved the black screen probl

Mac Mini, High Sierra 10.13.1, 1TB SSD, 8GB RAM, DELL monitor.

When my Mac Mini has been sleeping for a few hours, it refuses to wake up. I am then forced to press the start button on the back to start the computer. I had the same problem with the first version of High Sierra.

Hello there,

Well, my Mac Mini (Late 2012) is having some troubles with the HDMI after macOS High Sierra, not exactly the same as you, but specially after sleep the size of the display is wrong, the dock and the finder are almost out of view, I need to unplug and replug the HDMI cable to fix the issue, more than annoying to be honest.

Any clue?

Are there any news on this?

I have exactly the same Problem, so i got back to sierra from a TimeMachine restore...

My Mac-Mini (Late 2011) sits in the living room, connected to a LG-TV via HDMI. With HighSierra the Screen is just black with a tiny white line in the upper left corner.

Replugging the HDMI-Cable brings back the screen, until the next boot of the mini.

The mini starts up and shuts down every day on a time scedule, so i need to replug the cables after every reboot.

Thats not an option, as my TV and the Mac-Mini are build in an entertainment cabinet.

As my TV has only HDMI inputs, i cannot use any other Cable like VGA etc.

So it's impossible to upgrade to High Sierra before this Problem is fixed...

You have an image when unplug/replug. In my case, I've lost the HDMI output completely. I just tried to install Sierra 10.12.6 on an external drive, hoping that the firmware may be downgraded / updated, no fix. Then I installed High Sierra 10.13.2, also hoping that firmware may be reinstalled, no fix. Looks like the HDMI output is just bricked.

I am SO fed up with Apple ignoring the trash the Isis video is. They have not correct the crashing in mini’s which they have posted as compatible—they are not. Further, if like me you don’t have sufficient hdd room you can’t roll back to a working version. My computer was on for 36 hour’s no crashes until I went to load a new page. Now black screen. There’s no way to know for sure the cause of the crash.

Are you continuing the work-around by switching HDMI sources?

I have the same setup (but OS 10.13.1) and possibly the same issue. - Upon wake up/restart/power on receive a black screen with white pixel line in top, left corner.

It seems your work around is the most convenient.

I also think I had a similar issue with Mavericks, except it was a blue pixel. I don't power down the mini that often.

Are there any news on this?

I have exactly the same problem, so i updated to high sierra after replacing hd with a new one

My Mac-Mini (Late 2011) is connected to a LG-TV 49UJ6300

via HDMI worked fine with Mountain Lion. With HighSierra the Screen is just black with a tiny white line in the upper left corner.

Replugging the HDMI-Cable brings back the screen, until the next boot of the mini.

I have just bought a brand new Mac Mini and upon booting it and running for first time found that HDMI is defective. The Mac Mini is not able to show image on any HDMI display! Very disappointed in Apple quality. What is going on?

Don't know if it's related but my problem seems quite similar:

High Sierra: Mac Mini (late 2012) can't wakeup normally

(my screen is also black after waking up)...

Upgraded to Hi Sierra now have no video and regret doing so. How do I return to previous version? Is that even possible? I’ve unplugged HDMI and Reset NVRam

Well, well, well, clean shutdown, per on alt key, start sound, gray screen, white Apple logo and travel bar, color start and login. 💃

On the Startup Manager, you should get only the icons of the volumes with systems eligible for boot.

I think that my issue is worse because I can't even get an image either in the startup manager or from macOS Sierra installer (bootable key).