Mini Display port has stopped connecting to second monitor

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Mini Display port has stopped connecting to second monitor

I have used the Mini Display port to connect to a second screen for some time now on my 2014 Mac mini, using a Mini Display to DVI adapter and then DVI input into the second screen. At first it stopped connecting intermittently, and now has stopped connecting altogether.

I've tested the adapter/cable with a different screen, and have tried connecting with a different DVI cable and adapter, neither of which work... which leads me to think that it's a problem with the ports themselves (though this doesn't make much sense as neither of them work).

Is it possible that something can go wrong with the ports? or has there maybe been a firmware upgrade that means I need to update my DVI cable/adapter?

Any help much appreciated...

Mac mini, macOS 10.14

Posted on Sep 23, 2021 2:05 AM

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Answer 1

Top-ranking reply

den.thed

Level 10

82,342 points

Sep 23, 2021 7:18 AM in response to csquirrel

First try resetting the NVRAM > https://support.apple.com/en-us/HT204063

Shut down your Mac, then turn it on and immediately press and hold these four keys together: Option, Command, P, and R. You can release the keys after about 20 seconds, during which your Mac might appear to restart.

If that doesn't work?

Disconnect everything and reset the SMC > https://support.apple.com/en-us/HT201295

Desktop computers

Shut down your Mac, then unplug the power cord.
Wait 15 seconds, then plug the power cord back in.
Wait 5 seconds, then press the power button to turn on your Mac.

If that still does not help?

Use the Apple Diagnostics to Test your Mac Mini > https://support.apple.com/en-us/HT202731

Shut down your Mac.
Disconnect all external devices except keyboard, mouse, display, Ethernet connection (if applicable), and connection to AC power.
Make sure that your Mac is on a hard, flat, stable surface with good ventilation.

Intel processor

Turn on your Mac, then immediately press and hold the D key on your keyboard as your Mac starts up.
Release when you see a progress bar or you're asked to choose a language.