Officially, the late 2012 Mac mini will support two monitors in the following combinations:
one HDMI monitor while using one Thunderbolt monitor
two Thunderbolt monitors.
As for the supported resolutions, the late 2012 Mac mini supports up to 2560 x 1600 on Thunderbolt monitors or up to 1920 x 1200 on HDMI monitors.
Of course the above is the official ...
Corsair Mac memory 8GB DDR3L-1600MHz, 204-pin SODIMM (CMSA8GX3M1A1600C11)
I had 2 of this in my mac mini 2011 server, and run perfectly for 6 months , but now one memory has gone bad
Still runs, finds no error in mem test, but mac reboots from time to time... the other 8 is fine so i have just 8 now till decide what to get
I would suspect PRAM has some bad contents.
Check this article on how to reset PRAM:
Additionally, you may need to reset SMC:
I suggest getting high-quality USB-C to HDMI cables. You should never see link retraining messages unless your cables are flaky. I've had great luck with these: https://smile.amazon.com/gp/product/B073YPBWKB/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
I run 4 4K monitors off my 2017 15" MacBook Pro, 2 from each side, one goes through an OWC ...
Had similar issues for awhile, resolved via...
Changing combination of adapters / cables / ports as underlying ASICs (Application-specific Integrated Circuits) seemed to have different preferences / properties / thresholds.
Disabling 'Energy Saving' / 'Eco' / Etc. mode on connected displays.
Connecting displays to non-'eco controlled' (master / slave) ...
You can’t use three Thunderbolt 3 ports to drive three displays. You can accomplish this by connecting two Thunderbolt 3 to HDMI adapters/cables and one HDMI to HDMI/VGA/DVI adapter via the HDMI port.
A couple of things to consider when connecting monitors:
Use native signals rather than convert. Thunderbolt 3 is also DisplayPort, so it’s better to go ...
I think you're getting into trouble by trying to run a monitor at 75 Hz. Either lower the resolution or the refresh rate. Try 800x600@60. Once that's stable, step it up a notch until you know the limits.
I would also be susipscious of the quality of your HDMI to VGA adapter/cable. Does your monitor have an HDMI ...
According to Apple
Up to three displays: Two displays with 4096-by-2304 resolution at
60Hz connected via Thunderbolt 3 plus one display with 4096-by-2160
resolution at 60Hz connected via HDMI 2.0 [...]
So it is important to not exceed the maximum resolution supported.
Your 1080p Monitors seem to meet that spec so you will need to look at your ...