No HDMI signal after update

Is there a solution - after upgrade no longer does HDMI work with Catalina - SMH that Apple did not check this given their resources or issue some notice as to "what's new" and "what you have to do to fix the HDMI connection"

On hold listening now trying to get a human to advise on this - - must be a lot of problems as normally they answer quickly - this is very unapple like to blow something this basic

They broke something that did not need fixing or so it seems - and shipped it without testing it or providing instructions on protocol... hmmmm

My HDMI connection works better with 10.15.1, but when it comes back from sleep, the image is still distorted until I turn off my monitor and turn it back on. So the update for me was an improvement, but not a total fix.

Well I received my cool new $20 USB-C to DisplayPort cable from amazon, plugged it in, and guess what!

My 8 month old Mac Mini... STILL DOES’T WORK! Hey but when I push the power button it does get this cool little white light on the front. I have the absolute coolest $3000 paper weight around!

Haha,

I hesitated to buy the Belkin adaptator promoted on Apple's store thinking they might be evil enough to make other adaptators bug so you have to buy their own. But I would prefer to change the computer if it was true.

“Most of the time I can go into and out of Sleep mode with no problems, but once in awhile HDMI will not work when coming out of sleep mode.”

I have that problem occasionally as well, though it’s been rare of late, I had it with Mojave too, but since 10.15.1, things have been pretty stable. I suspect there’s still something going on, I’m just one of the lucky ones who don’t have problems now.

Don't know if it has been mentioned here before but there is a special page to report any bug here : https://www.apple.com/feedback

I contacted the support again and they told me that the apple dev team is looking at those feedbacks.

I guess it is more effective to contact them directly rather than discussing between us.

I hope this issue will be fix quickly, it's very crippling.

I called Apple Support October 8th and then they ask for the logs. After I sent it to them, no one tried to contact me with this case.

I am amazed that Mac users around the world do not make a larger scandal. I see two options:

1) this problem is small - they will leave us with this mess

2) they don't want to do anything with it - it looks like a purposeful error.

Why I won't go back to previous OS? I will lost notepad and reminders synchronisation between Mac and iPhone.

Now it looks like I should buy new display. Preferably from apple.com ;)))

Since updating to 10.5.1 I am now getting random but frequent disconnecting mouse and keyboard issues, tried resetting bluetooth but no improvement, really getting ready to finally move away from Apple. Its just not working for me anymore. One issue after another.

I have a Mac mini 2018 hooked up to a 40 inch Samsung 4K TV / Monitor. Prior To Catalina, Mac mini would wake up and display video on the TV with no issue. As soon as I upgraded to Catalina, I have too hard reboot my Mac mini around 5 - 7 times to get into a forgot password mode where I then reset and can get into the MacMini. Also, my keyboard and mouse have been disconnecting randomly. Please Resolve.

I upgraded to 10.15.2 last night hoping my HDMI issues would be resolved. Sadly, not the case for me. However, in checking my firmware version, I'm still on 2.14. Does anyone know, that has talked to Apple Support, if there is a way to update this firmware manually?

The issue seems to be resolved for me. I moved my Mac mini to a different room over the weekend, and when I hooked up my monitor I left the HDMI to USB-C adapter workaround aside, plugging the monitor directly into the HDMI port. It’s been a few days and I haven’t experienced any of the same issues I used to. I’m running Catalina 10.15.3.

any fix for this yet?

ok resetting pram solved it for me.

already try all other hdmi ports in sony tv but still no signal !