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Upgrade the memory of your 2018 Mac mini up to 64GB
Upgrade the memory of your 2018 Mac mini up to 64GB

2018 Mac mini has Serious Trouble Syncing with Display via either HDMI or DisplayPort

Update Feb 1: today, I was unable to get the 2019 Mac Pro to work with the NEC PA271Q even once. After 20 minutes, I gave up and had to connect an LG 5K display so I could wipe the Mac Pro I was sending back. I could actually hear a high frequency noise from the display which I associate with a second or two of attempted video sync. Whether this is a hardware or softwase issue is unclear, but it’s a new behavior that I associate with macOS Mojave and macOS Catalina and perhaps the newer Thunderbolt 3 chipsets—could be a hardware compatibility bug.

...

I bought a 2018 Mac mini back in May, hoping to use it as a 24 X 7 server. But that can’t work because rebooting (which has to be done sometimes) frequently meaning usually the Mac mini will not sync up with the display!

Options for Connecting a Display with Mini DisplayPort or DisplayPort input to a Mac with Thunderbolt 3 / USB-C.

Without a display, I cannot use Apple Remote Desktop. And driving 30 or 300 miles to the server room every time the Mac mini has problem is unacceptable, let alone a hard reboot.

This display syncing on the 2018 ac mini has been a problem since May, so it is both Mojave and Catalina. Before Mojave, I never had significant display syncing issues. With the Mac mini it is a terrible problem, and on the 2019 Mac Pro on Catalina, it is just as bad.

Mac mini display syncing details

Sometimes it can take 5 minutes just to get the display working and I dare not reboot or let the machine sleep or I have to do it all over again, often with a hard power on/off (very bad idea).

The Mac mini won’t sync ANY of these:

Apple, I want my money back for this useless POS Mac mini you tech-porn poseurs sold me. I have $1600 into the Mac mini which cannot function as it ought.

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