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Level 1

46 points

Monterey 12.3.1 External Monitor/Display Issue - No Longer Outputting Signal

After updating my Mac Mini today to 12.3, my monitor now no longer displays an image via USB-C, just keeps saying on no signal on the monitor.

I have tried HDMI and same issue. The odd occasion it will display a picture but once I shutdown or restart the mac mini it does not display a picture. The mac is booting up. I have had to resort to connecting it to my old TV with HDMI connection.

This is so frustrating

I have tried resetting the SMC which had not appeared to work, also tried downgrading the displayport version from 1.4 to 1.2 (on the odd occasion I did get a picture) but that has not worked either.

Has anyone else having this issue?

The monitor I use is a BenQ SW270C.

This is really doing my head in and was wondering if anyone else has got a fix to this.

[Re-Titled by Moderator]

Mac mini, macOS 12.2

Posted on Mar 17, 2022 12:48 PM

Best reply

abhage

Level 1

12 points

Posted on Jun 1, 2022 9:43 AM

Apple - you have purposefully made this as hard f*****g possible to remediate because, unlike Windows, you are so arrogant in your OS updates (that you clearly do not QA at all), that you offer no downgrade option. ALL - this is the definitive solution that I employed THREE (3) WEEKS prior and I have not had ANY issues since then,

Backup your entire SSD via direct connected Time Machine. If you are like me with a large SSD, congrats, APPLE FORCED YOU TOO, to spend $500+ on on an Samsung 4TB external SSD (link) where you can use this USB-C to SATA connector (link) - all regular links to US Amazon; sadly, I have no referral code/links.
Download version 12.1 from this site (link)
Create a bootable install USB key (link)
Boot into safe or recovery mode and re-partition your entire SSD (this wipes the entire computer FYI, but is the ONLY OPTION APPLE has made available at all...)
1. FYI - at this point I recommend that you just hardware your laptop into your router or switch and bypass Wi-Fi; its faster and easier.
Set up the "new laptop" as fast a possible; your going to wipe the entire "new"/"temp" user anyway.
Restore Mac from Time Machine backup (link) - delete that temporary user from the prior step; wait like 4 hours maybe (that's about how long my 3.4TB SSD restore took.
No more issues. For weeks, blissfully easy use once again.

** Apple, you owe me 20+ lost billable hours or work, at least many hours in lost work, and over $500 for having to purchase equipment only need to remedy your insane f*** u*; congratulations, QA and OS teams - those I doubt you were the ones who made the decision to focus on continually increasing levels of completely dumbs**t; but at least we have a **** ANIMOJI...might as well be your new logo.

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Monterey 12.3.1 External Monitor/Display Issue - No Longer Outputting Signal

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