Mac mini M4 screen go black randomly

I got a new Mac mini m4 today, and I've noticed the same issue. The screen goes black randomly for a second or two and comes back again. I upgraded from a Mac mini m1 and switched it back and forth. Doesn't seem like and issue with the cable or the monitor to me. Still trying to figure out!

It does depend on the quality of the monitor, but HDMI is, first and foremost, a TV connection. And by quality, I mean cheaper monitors often limit HDMI to the original HD resolution of 1920x1080, regardless of any higher resolutions the monitor can support under a DisplayPort or USB-C Thunderbolt connection.

That, and over the years, I've seen far too many posts here by folks trying to use HDMI. Issues which disappeared when they used their monitor's DisplayPort option.

I have an EIZO monitor that allows me to use DisplayPort, USB-C or HDMI. Given the cost of these monitors, I know HDMI would work (with a proper high speed HDMI cable), but I'm still going to use a connection meant for computer monitors before I'd even consider HDMI.

Having an HDMI port is intended for video work. It eliminates the need for a break-out box. You use DisplayPort or USB-C to a monitor for your work screen in Final Cut Pro, Avid, Premiere Pro, DaVinci Resolve, etc., and a separate HDMI output to a reference monitor (TV) to see how color will appear on a TV as you simultaneously work in your video editor.

Same here M4 mini. 2 x AOC 4K screen connected via USB-C to DP cable. Replaced cable twice, bought new cables rated for 8K. same issue. No power cable issues. Screen connected via same cable to other PC have no issues.

According to the manual, this monitor has an analog D-Sub connection and a digital DVI-d.

If you have any open USB-C ports on the back of the Mac, I would suggest a DVI to USB-C adapter. One such adapter on Amazon.

That it doesn't even have a DisplayPort option suggests this is very old monitor. A 2004 release date, actually. I would very much suggest rather than spending the money on a cable, I'd get a much newer monitor. There are plenty of 4K choices on Amazon that are right around $200. Then you not only have a much higher (sharper) resolution monitor, but options to use DisplayPort or USB-C.

The main drawback with the inexpensive models is they have cheap panels that only display the sRGB color range and gamut. Just about the smallest, least colorful RGB space in use.

Or, just get the cable to spend the least amount of money. Up to you.

Reseat the connections of cable on the mini and the monitor. If that doesn't help, try a different cable.

Also check the power cord to the monitor. I had that happen where it was just loose enough that the monitor would blank out every so often, then come back.

As I understand it then, the monitor cable is permanently attached, and has been repaired on top of that?

If so, that sounds like the case of a bad cable. It worked fine on the other mini - as long as no one touched it. But being moved and flexed to connect to the next mini has caused a bad connection that was already there to show itself.

Short of replacing the monitor, about all you can do is jiggle the cable so the mini can get a signal.

New Mac mini m4. 24/512. Hooked up to an LG 34" wide monitor. Monitor works great with laptop. HDMI cable is good, Input port and power plug is fine. Monitor works flawless with my laptop.

Using the Mini: monitor goes black 3-4 times an hour, for about 5 seconds. Computer seems to run fine, no processes get ruined. But the screen blacks out. Keeps happening all; day.

I took machine to Appel Store, they actually replaced my Mac mini. The NEW Machine does the same thing!!!

Wow.

Something I had to first look up because I keep forgetting what the color space is called.

Supposedly, you can choose between RGB and YCbCr color formats for HDMI output, with YCbCr being the default for HDMI connections. How do you choose? Good question, as I've never looked it up.

That's the main difference. HDMI on the mini can handle up to a 4K, 60Hz output. Plenty of bandwidth for a good monitor. But it's the color space that's important here. Computer monitors expect RGB data. When you use HDMI, RGB has to be converted to YCbCr (TV color) before being sent to the monitor. Not that the very few milliseconds per frame it takes to do this is anything you'd notice.

It's also why HDMI to DisplayPort, or HDMI to USB-C cables sometimes don't work. The computer and monitor are then both confused. Are you trying to get RGB, or YCbCr color? Which again, is something better quality monitors can handle, but is also still not a preferred choice.

HDMI should always be the last choice for a computer connection. Does the monitor support DisplayPort? If it does, use that.

I have the same issue. Plus, occasionally, when waking up the Mac the monitor wakes up but the screen remains black. Only way to get it working is to unplug and plug the HDMI cable.

Why?