Level 1

54 points

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

I upgraded my Mac Mini 2011 from Mac OS Sierra to Mac OS High Sierra

During the upgrade process my screen went black. I was able to get it back in disconnecting and reconnecting the HDMI cable on the Mac Mini.

Every time, I wake the Mini from sleep, the screen stays black. The same also happens after a reboot. Dis- & reconnecting the HDMI cable brings it back to work. Turning my TV off and on is not sufficient.

I did a reset of the PVRAM How to reset NVRAM on your Mac - Apple Support with no change

I had to recalibrate my display as some of my e-mails were showing up in black: Re: Conversation view in Mail broken in High Sierra

Any hints?

Mac mini, macOS High Sierra (10.13)

Posted on Sep 30, 2017 7:15 PM

42 replies

petralyn

Level 1

7 points

Nov 29, 2017 10:54 AM in response to Shirkan79

I don’t have space on hdd for rollback. And NO Apple support.

Sent from my iPhone

Petra Lynn Hofmann

331.642.0625

Dec 6, 2017 3:03 PM in response to krupal

Hi. Unfortunately, I tried to reboot from the Internet Recovery (command+option+R) but it didn't unlock the HDMI output.

Willso7

Level 1

4 points

Dec 10, 2017 7:17 AM in response to mfehr

Same problem here, i have to unplug and replug the HDMI .......... Hope Apple fix it soon.

Dec 12, 2017 9:12 PM in response to bastugatan

I thought ... Now the problems are back again. When I wake up my Mac mini, the screen is black. Must press the power switch to make the screen respond.

brogon

Level 1

4 points

Dec 19, 2017 8:23 AM in response to mfehr

I have a workaround that runs the cscreen utility twice with two different resolutions at login. I'm having a difficult time posting the details here. I'll try later.

Forndog

Level 1

4 points

Feb 3, 2018 10:15 AM in response to mfehr

Has anyone found a solution or spoken to Apple about this?

mfehr Author

Level 1

54 points

Oct 2, 2017 7:58 AM in response to chris_g1

I did 2 additional tests to isolate the issue:

I removed autologin to be sent to the login page first after a reboot. The screen is blank
I connect to the Mac Mini using a Screen Sharing session. When I modify the display settings to any entry, the HDMI display gets to work

So the problem must be related to the display driver and/or the calibration on High Sierra.

Franck S

Level 1

4 points

Oct 31, 2017 2:36 PM in response to Franck S

I've installed over the actual system the macOS High Sierra 10.13.1 installer from the Mac App Store. Unfortunately, that does not fix the issue.

Nov 1, 2017 6:09 PM in response to bastugatan

I just press the power button quickly. Then my Mac Mini (Late 2014) wakes up again. No restart.

Dec 12, 2017 8:32 PM in response to bastugatan

Today I created a new user account, logged in there and then back to my old. Then my screen issues were gone. So simple.

brogon

Level 1

4 points

Dec 19, 2017 8:55 AM in response to mfehr

brogon

Level 1

4 points

Dec 19, 2017 9:10 AM in response to brogon

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