M1 Mac mini display issue

Same problem here. Also, sometimes when it goes out of sleep, there's red and white noise appearing in my screen. I've called apple support and they said its my screen or the connection. I've changed the screen and HDMI cable, still have this problem. I Have a Genius Bar appointment soon.

If at all possible, take your monitor with you and/or test it on a selection of monitors before you go. Last thing you want is a store rep being unable to reproduce it using "apple suggested" equipment, or apple equipment.

Weird. Mine is horribly inconsistent but almost always after logging in, only on desktop. Opening an app doesn’t make it go away, unless it’s covering it, then it’s gone even when moving the window aside.

It doesn’t happen at every boot. Most times it doesn’t happen at all.

Wondering, have you ever only covered half screen with an app to see if they appear randomly well after boot up? My monitor is 1440p so I often only use part of the screen, I’ve noticed them occurring later on after boot

I think some of us are hoping the issue is fixed so we can order another one without fear of the same issue happening. I returned mine too. I might just wait until after the first of the year and get a MacBook Pro when I have a little more cash.

There are some compatibility issues between Mac mini and ext monitors.

I had this issue twice - reinstalling OS and update to 11.1.

Both issues disappeared after second boot and never came back since...

Definitely software issued swapping Macs will not resolve it.

Just be patient for OS Fix, it will come eventually as Apple is well aware of this issue...

Price we pay for being "first adopters" I guess ;)

There are some compatibility issues between Mac mini and ext monitors.

I had this issue twice - reinstalling OS and update to 11.1.

Both issues disappeared after second boot and never came back since...

Definitely software issued swapping Macs will not resolve it.

Just be patient for OS Fix, it will come eventually as Apple is well aware of this issue...

Price we pay for being "first adopters" I guess ;)

The problem is that the corruption is internal. I could move the mouse cursor over my pink display artifacts. If it were a display compatibility issue that wouldn’t be possible. If it’s an HDCP failure then the whole screen would blank out.

Whatever it is is internal. It very well could be software but based on the differences in the way it is presenting itself to everyone here my guess is hardware. It’s possible that a software fix could work around or resolve the hardware issue too.

I used to work for many big names supporting computer monitors, televisions, PCs, etc. Samsung, Sony, and Toshiba were just some of the brands I supported.

After another week with this problem I have discovered that the issue completely resolves (for me at least) when I move the Mac Mini a meter away from all peripherals (monitor and bluetooth keyboard & mouse). Could this be a proximity interference issue? The pink artefacts at boot-up and during the login screen have completely vanished after this 'experiment'.

i hit the jackpot, pink squares, screen shut down and horizontal lines. :/

ive tried every thing and only one thing solved the problem. Ive moved de mac mini to the living room and tryied to use it on the tv. The problem was solved no more issues. It makes me wonder if it is a signal interference issue.

Day 2 with a new monitor (LG 34WN80C-B) and nothing yet. Connected over its USB-C port w/ keyboard and mouse in back of screen too.

It does have one stuck pixel I can't clear though haha, they joy never ends.

Yeah I will give it a try in a day or so, still not 100% convinced I wont see the problem occur here but so far so good.

Worth nothing that on my previous monitor (BenQ XL2430 24-inch 144 Hz) I could produce the issue with the keyboard & mouse plugged directly into the Mini, or with them plugged into the monitors USB pass-through. Plugging them into the monitor however caused an extra issue in that I'd have to replug the keyboard on each reboot to make it work.

Best

Hi, I just had an interesting talk to one super friendly apple support guy via telephone.

I was calling because I had Bluetooth issues (especially when using wifi) he told me to reset my SMC (power off your Mac mini unplug it - wait for 15 seconds - replug it and wait another 5 seconds then turn it on - this will reset the SMC ) this in fact solved my issues with bluetooth! I also mentioned issues with my Mac mini showing weird artefacts after it went to sleep - his guess was that this could also be an SMC issue... Currently testing and sending my Mac mini to sleep and wake it up again a couple of times - if I don't reply to this, the problem is solved for me and you may want to try it as well.

all the best

Ok after a couple times I sent the Mac mini to sleep I can now confirm that the reset of the SMC helps with the bluetooth issue (came back as soon as the mini went to sleep) unfortunately the issue remains with wifi and bluetooth in combination...

The pink spots are also appearing on my screen after booting but only then for now.

Best

I'm still getting pink squares during login from cold boot on the primary monitor, but I haven't seen them persist to the desktop for ages now.

I have 2 monitors connected. 1 USB C, 1 HDMI. My wife's profile has HDMI as main monitor, mine has the USB C.

After the last update there are fewer pink squares, but that's because there's a much quicker transition from the password screen to login screen. There used to be a black screen, then login screen came back briefly with bar showing profile loading, before transition to black and into desktop. The pink squares would mostly appear during the brief glimpse of the login screen again. The latest update seems to have removed that middle screen and it's a fairly fast fade to desktop now, so there's less opportunity for the pink squares to appear.

Interesting observations about proximity to the monitor.