Macbook Mini DisplayPort Adapter Randomly Stopped Working, Others Won't Work Either

Question

Macbook Mini DisplayPort Adapter Randomly Stopped Working, Others Won't Work Either

I have a 2017 MacBook Air, using macOS Catalina (v 10.15.7). I recently bought a 27 inch Samsung monitor and I've been using it for several weeks without any issues. I connect my Macbook to the monitor using a mini DisplayPort adapter to HDMI. Again - everything worked fine for several weeks. Then, randomly, without any updates, everything stopped working. My monitor is blank (black) when connected, and my MacBook screen just goes black every second or so.

Here's everything I've tried:

different HDMI cables
restarting macbook
unplugging monitor (from power supply) for many minutes at a time
different mini displayport adapters - different brands even

Nothing works! I've spent hours browsing forums and trying random things and I can't get anything to work. Please help!!!!!

MacBook Air 13″, macOS 10.15

Posted on Jul 14, 2021 1:18 PM

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Answer 1

Top-ranking reply

Axel Foley

Level 10

150,972 points

Jul 17, 2021 1:16 PM in response to Johhny_bones123

Not sure whether you have tried some of the basic troubleshooting methods on your MacBook Air and therefore I will list them here. Before you try the following, ensure that you have powered down the monitor (one more time) and then powered up. If there is a setting on your external display to return it to factory settings then please do that.

On your Mac Book Air:

Reset SMC by following the directions applicable to your MacBook here ➔ How to Reset SMC. If that does not solve things then-
Reset NVRAM/PRAM by following the directions applicable to your MacBook here ➔ How to Reset NVRAM/PRAM. If that does not solve things then-
Enter ➔ Safe Mode and see if the issue still exists in Safe mode. Log out of Safe Mode and then reboot computer. If that does not solve things then-

One question, if none of the above works, have you tried using a direct cable rather than adapters with this display?

Axel F.

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Answer 2

Axel Foley

Level 10

150,972 points

Aug 13, 2021 6:59 AM in response to Johhny_bones123

Is there a way to reset your external Display? Read the manual and return it to factory settings and try again. If that doesn't work then try another external monitor if you have one.

You have tried all of the steps that I listed above in my previous response. Can you try them again and ensure that they are executed perfectly? If none of those steps work then you can enter your Mac into ➔ macOS Recovery Mode and reinstall the macOS and see if that solves it.

Axel F.

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Answer 3

Aug 9, 2021 11:52 PM in response to Axel Foley

Hi Axel,

Thanks so much for getting back to me and helping me out!

I've tried all of the above steps, and nothing works. I'm still facing the same issue. So bizarre!

Regarding a direct cable - I will try that out. I'm absolutely desperate at this point!

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Answer 4

Aug 13, 2021 1:11 AM in response to Axel Foley

Hello again Axel,

So I received a direct cable in the mail today and it still doesn't work.

Any idea what the issue could be at this point? Hardware is really not my specialty. I would appreciate any insight you have, as I'm still in a desperate situation.

Thank you!

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Macbook Mini DisplayPort Adapter Randomly Stopped Working, Others Won't Work Either

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