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FIXED (workaround): Mac Mini HDMI not working - now working

B74A

macrumors member
Original poster
Mar 31, 2008
96
1
Asia and Europe
HDMI from Mac Mini to a TV or monitor not working? I had that problem too.

-

Fairly new Mac Mini, and our only display is a 2019 Samsung 50" TV.

The TV says "No Signal" whether using a HDMI cable from the HDMI port, or the USB-3 to HDMI cable. Tried various combinations of ports and cables.

I found one way to make it work:

1. Make sure Mac Mini is switched off
2. Turn the TV on, and select another HDMI port than the one used by the Mac Mini (whether there's a signal or not, doesn't matter)
3. Click the Source button on the TV remote control, and arrow to the side to highlight the HDMI port number where the Mac Mini is connected to, but do not select it until ...
4. Click the "enter" button on the remote, to select that HDMI port number, while simultaneously switching the Mac Mini on.


When doing this, all is fine - the picture comes on as it should (after a few seconds).

Anything else I do, any combination of cable I try, doesn't work. But this seems to consistently work.

My guess is that the Mac Mini is looking for an HDMI when it's starting, as the TV is looking for an HDMI source when you select that input. They apparently only do that for a few seconds (maybe 10 seconds?), and if they don't do it at the same time - no picture. The TV will say "no signal" and give up. The Mac Mini will say "No HDMI connected", and also give up. Unless they look for each other at the same time.

Not ideal, but at least I have found a consistent way to make it work.

Anyone else with HDMI problems on a Mac Mini, please try this procedure and see if it works. If it works to fix this, Apple and/or Samsung should be able to "meet somewhere in the middle" and make a permanent fix for this problem. One more guess: They will both blame the other party for not conforming to whatever standards rule HDMI ...
 

iambarney

macrumors newbie
Nov 8, 2020
1
1
Hi, thanks so much for posting this!

I've had my Mac mini for well over 2 years and have never, ever had an issue with HDMI. I did, however, recently get a new Dell monitor (SF2721DGF) but the Mac mini was playing very nicely with it for over a month now.
I regularly switch between my work laptop and my Mac mini throughout the course of the day (sometimes dozens of times a day) with zero issue .. until today.
I'd switch over to the HDMI 2 input and .. nothing. Unplugged the cable, tried a new cable, rebooted, reset PRAM/NVRAM to no avail.

Then I stumbled across this post! For whatever reason, your workaround solution works and I created an account just to say thank you for posting the solution. I'm replying to this post to hopefully give another random user confidence that this will fix the issue.
 
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B74A

macrumors member
Original poster
Mar 31, 2008
96
1
Asia and Europe
Hi, thanks so much for posting this!

I've had my Mac mini for well over 2 years and have never, ever had an issue with HDMI. I did, however, recently get a new Dell monitor (SF2721DGF) but the Mac mini was playing very nicely with it for over a month now.
I regularly switch between my work laptop and my Mac mini throughout the course of the day (sometimes dozens of times a day) with zero issue .. until today.
I'd switch over to the HDMI 2 input and .. nothing. Unplugged the cable, tried a new cable, rebooted, reset PRAM/NVRAM to no avail.

Then I stumbled across this post! For whatever reason, your workaround solution works and I created an account just to say thank you for posting the solution. I'm replying to this post to hopefully give another random user confidence that this will fix the issue.
Hi iambarney,

I often look for solutions online, when something doesn't work the way I want. We all benefit from problems solved by others, and I am happy that in this case, I could be of some help. There IS another thread, about this similar issue, but I thought it was so important what I found that I "had to" make a new thread with just that (including my solution). Often, when someone has an issue, the first many posts do NO provide a solution. In this thread, the solution is in post #1 - easy!

I am, however, also interested if there are users out there who has this problem and it is NOT fixed by this workaround. And ideally, Apple AND Samsung must find a fix for this. At least there should be some kind of option to "rescan" the ports, AND keep it for more than just a few seconds. Like a minute? So you don't have to juggle with pushing two buttons at the same time.

I would say, the Mac Mini is the one that's most critical here. It's easy to switch back and forth between HDMI ports, or even switch a TV on and off. But to have to switch the Mac Mini entirely off (without being able to see the screen to shut it down ...), that is not only time consuming but also often forces you to hold the power button (or remove the power supply cord) for a forced power off of the Mac Mini.
 
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B74A

macrumors member
Original poster
Mar 31, 2008
96
1
Asia and Europe
Some say that instead of rebooting, it is enough to simply unplug the HDMI cable then plug it in again. That didn't work for our setup, but maybe it does for yours?

More reading here:



In many cases, it was a problem that occurred when upgrading from Mojave to Catalina. Some reverted, and it worked again. Maybe the latest Catalina upgrade a few days ago fixed this? I am not close to my own Mac Mini so cannot check it.
 
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harriska2

macrumors 65816
Mar 16, 2011
1,324
668
Oregon
Weird. I have a 40" Samsung and use HDMI with my 2018 mini. Never had a problem and am still running Mohave. I'm worried Big Sur will mess up HDMI on my mini - love the sound that comes out of my monitor so I don't want to use an adapter to thunderbolt or whatever else.
 
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