MacMini M4 Pro (extended monitors) nightmare

Re: MacMini M4 Pro (extended monitors)

Wondering which MacOS version is installed: What's new in the updates for macOS Sequoia - Apple Support

Eg: says: macOS Sequoia 15.3.2 is the latest version:

"This update provides important security fixes and is recommended for all users."

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Re: What am (I or Apple) doing wrong, any ideas?

Am no expert in this area, yet your post to the community deserves responses.

Seems there can often be a small detail that, when known or attended to, can make all the difference.

Checking through the basics may (or may not) help uncover an overlooked detail:

Re: "Spec's for the mini M4 pro, claims these two monitors should work (4K 60hz).

However there doesn't seem to be any information on the correct setup."

How many displays can be connected to Mac mini - Apple Support

Eg: says:

Mac mini (2024) with M4 Pro chip

supports up to three external displays simultaneously, depending on the resolution (up to 8K) and refresh rate (up to 240Hz) of each external display.

Supports three external displays in this configuration:

• • Three displays up to 6K at 60Hz (or 4K at 144Hz) over Thunderbolt
  • Two displays up to 6K at 60Hz (or 4K at 144Hz) over Thunderbolt, and one display up to 4K at 144Hz over HDMI

Tips on how to: Connect a display to your Mac - Apple Support

and: If your external display is dark or low resolution - Apple Support

Also: Connect one or more external displays with your Mac - Apple Support

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Re: "Tried different ports on the Mini, and different cables."

See: How to: Identify the ports on your Mac - Apple Support

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Re: "I recently started researching thunderbolt 5 docks, I found an obscure thread somewhere which mentioned that they might work but still could be dicey."

Info. on Adapters for the Thunderbolt or USB-C port on your Mac - Apple Support

Eg: says:

The adapters and cables in this article work with Mac computers with Thunderbolt 5 ports, Thunderbolt 4 ports, Thunderbolt 3 ports or a USB-C port. If your Mac only has one port, it doesn’t support Thunderbolt connections.

If needed: Studio Display - Technical Specifications - Apple

Website: Displays - Official Apple Support

Ace1944 wrote:

And to the Sony's: It wasn't me, it was you.

FYI,

Each monitor is supposed to have a unique serial number. Sometimes vendors cheat and program batches of monitors with a single serial number, so they can use one image for all of them. If you're unlucky, and get two monitors from the same batch that have the same serial number, and hook them up to the same computer, the duplicate serial number may cause problems with the computer properly recognizing both monitors. To make things worse, I'm not sure if there's an easy way to double-check the serial numbers on a Mac to confirm or to deny the presence of such a monitor bug.

I have no idea if this was the issue with the monitors you returned. Whatever the issue, I'm glad to hear that the new monitors worked out for you.

To add, Mac's do not do well running dual displays thru splitters, switches or hubs.

For the best results, the M4 Mac mini needs to see each display on a different output port.

(two on different TB/USB-C ports or one on a TB/USB-C port and one on the HDMI port)

see "Display Support" at > Mac mini (2024) - Tech Specs - Apple Support

and > Connect a display to Mac mini - Apple Support

Which 27” Samsung monitor? (A review of the 27” ViewFinity S70A 4K reports it is not compatible with Macs. There’s also the 27" ViewFinity S7 (S70D) 4K. Probably others.)

What has Apple already suggested? What happened? Without these details, suggestions will be repeated.

Firmware current?

Tried different displays, or just these two unspecified Samsung monitors with the Studio Display?

The original post stated Samsung 4K, this reply states Sony, and the monitor part number appears to be Samsung 2K.

I’ll assume this is a Samsung G6 GS60SD 2K.

Use the model number from your particular monitor, and check for and load monitor vendor firmware updates.

I have put out a call to other regular forum contributors to see if we can get you some help here. Unfortunately I don't have any experience with multiple displays on the M-series Macs.

Re: “I set it up using hdmi to usb-c/thunderbolt, using a hdmi splitter,”

What do you mean by HDMI splitter?

Thank you kindly for your prompt reply and added info. All the best with your plan!

Hello again!

So good to hear how you finally solved the issue! Thank you kindly for replying with all the details. Wonderful to know you no longer have that problem. Cheers!