Let me know if this helps, for further assistance. If none this work, recommend you to check with Apple for support. Second one shows your display model and resolution it is working in. (If you are not getting any display with this monitor and if the Mac mini has 2 display ports, try connecting both the monitors to get a display and do an update using the Apple menu) Also, if possible try a different HDMI cable. While the miniDVI can't normally support a LCD >1920x1200, I'm able to drive a QH270 at 2560x1440 using miniDVI->VGA adapter, and still cano hook up another high res display to the MDP port. First one shows the exact model of your Mac and its GPU. I currently have one of the Late 2009 Mac mini's with MDP and MiniDVI connectors. When opening a PR, please attach screenshots like these two. Thunderbolt version enabling only came in 2018, so it’s unlikely Macs before that would have the support. I want this list to stay as reliable as possible.

Results you didn’t experience yourself (e.g.

Anything already officially reported by Apple (yes, 5k/6k work just fine at boring 60 Hz).

Most Macs have no trouble powering those, so there’s no point in building a list. Any results about lower resolutions (1440p 120Hz or 4k 60Hz).Both positive (it works) and negative (it doesn’t work) results.The M1 MacBooks and MacBook Pro models can use one. Officially, MacBook Air and MacBook Pro models using the M1 chip only support one external monitor. If you want to add a second monitor to the M1 Mac mini, you have to use the Mac minis HDMI port. If you have a combination of 4k monitor with 120+ Hz refresh rate and a Mac that’s not listed here, please open a PR (don’t worry about graphics/icons, I can add those myself). The Mac mini running Apples M1 chip can only use one Thunderbolt/USB 4 monitor at a time. Gigabyte M32U (4k 144Hz) How to contribute? Thanks to tonycapp, my Mac mini M1 (2020: 16GB, 1TB, macOS Big Sur 11.3 Beta 2) now has a working dual HDMI display setup.

Mac mini monitor support