How to fix refresh rate Issues on Dell monitors after Sonoma update

After updating to Sanoma 14.3, I still had darkness on my Dell, only after unplugging the USB C to display port cable many times I got an image. The image disappears as soon as I start moving the cable. This is crazy. Could it be that the Sonoma system was giving a weaker signal to the Displiy port? ???. I don't use any guides in the Ventura system, so it all worked fine for me.

Same issue. Macbook Pro 13-inch, 2020, using Thunderbolt to a USB-C hub to a Dell U2723UE monitor via HDMI. All fine before Sonoma. Now not.

Monitor shows up in the Displays panel, but monitor reports "no signal" and goes to standby.

I have the same problem. I have two dell monitors and the mac m1 2020. I searched several topics and didn't find the solution.

My impression is that Apple doesn't care and doesn't give feedback, all the possible solutions I found here didn't work. I am using one monitor and the other is turned off (not in use).

Well this is fun! Ever since Sonoma 14.3 I hadn't had many issues, I was silently hoping it was fixed. NOPE!

no settings have changed, and its back to disconnecting external drives, back to the Apple Thunderbolt Display not being recognized from sleep mode, and this... this is the new one!! My screensaver for both monitors (not 3rd party) both just keep randomly changing to whatever they want (no its not set on random) one usually sticks to what its supposed to be and the other just picks something else, then I will fix, then repeat, then I fix, then they swap and repeat. Im ready to be done with Sonoma already. I am holding out for the next update... I do not want to do a wipe clean. UGHHHHH

just here to LOL, that now Im seeing all of these news articles DO NOT UPDATE TO SONOMA 14.4! Apparently the issue alot of us are having is more wide spread plus more issues! Ironically, my issues have been much better with my Apple 27" Thunderbolt display staying connected to My 2020 27" iMac... Hopefully the next OS "just works" and we can stuff Sonoma in the "vista closet" and never look back! LOL

Tried that first. It doenst work. It was also charging via the USB C in Ventura. It is not now.

I have a Viewsonic VX1655 4K OLED and it only shows 60 Hz when HDR is on - otherwise it's 30 Hz tops. I reported it to Viewsonic.

M2 MBA with an external Dell 2k monitor that anytime I reboot the Mac the monitor doesn't come back. I have to unplug it and plug it back in to get it back.

I'm having the same issue. Upgraded to Sonoma today and it's not recognizing the LG monitor. Tried unplugging and restarting everything. Nothing is working.

I've never had a problem with this Mac or the cable until I upgraded to Sonoma so I'm going to say it's not the pin out of the cable.

After my original post I updated to an M2 Macbook 14'' Max and this is no longer an issue. That could imply the issue is Sanoma on specific models only.

iturn2 it actually broke my webcam completely. It is no longer recognized at all. Nothing I have done has been able to bring it back.

brainstewn, I am starting to think Apple is trying to force us to buy there expensive monitors.

Same issue... my external monitor Dell SE2719HR is no longer working with my Mac Pro M2

Yep same.