U4025QW, DDPM, device not connected

Manuals linked below -- did you connect the USB upstream port to the host computer?

https://www.dell.com/support/product-details/en-us/product/u4025qw-monitor/resources/manuals

* Open the monitor Menu--> Others
* Run Factory Reset
* Verify that DDC/CI is On
* Exit the monitor Menu

Run the DDPM Repair =
- Go to Settings > Apps > Installed Apps, select DDPM (Dell Display and Peripheral Manager), choose Repair
- When done, retest

If not working after Repair, run the complete uninstall and install =
* Uninstall DDPM and if still listed, the legacy end of life DDM (Dell Display Manager) and DPM (Dell Peripheral Manager) from Settings > Apps
- Restart the computer
- Download and install the latest DDPM
- Restart the computer when finished

* Once the computer is restarted, press Win + R, type services.msc, confirm Dell Core Services is set to Automatic and running

* If still not working and you are still under warranty, click the Get Help Now button at the bottom right of this page to chat with Dell Support and get a unique Technical Support case created

@DELL-ChrisM2​ I have run the DDPM Repair but it just says "Are you sure you want to quit Dell Display and Peripheral Manager Setup?", the only option is OK. I run the uninstall and it gives me exactly the same message

@ejn63​ Sorry, why do I need to connect the USB upstream port to the host computer? I have Thunderbolt (140W) and HDMI connected to the laptop

When running Repair or Uninstall that prompt is normal. It has to quit. Then you restart it.

Laptop HDMI out port --> U4025QW HDMI to HDMI cable --> U4025QW HDMI in port
Laptop USB-C/TB port --> U4025QW TB4 cable --> U4025QW TB4 upstream port
-or-
Laptop USB-A port --> U4025QW USB-A to USB-C cable --> U4025QW U4025QW TB4 upstream port

Click the Get Help Now button at the bottom right of this page to chat with Dell Support and get a unique Technical Support case created.

@DELL-ChrisM2  It displays that message before it has even completed the uninstall or repair. No matter how many times I restart it, it does exactly the same thing and DDPM is still listed as an installed app.

I have this cable configuration...

Laptop HDMI out port --> U4025QW HDMI to HDMI cable --> U4025QW HDMI in port
Laptop USB-C/TB port --> U4025QW TB4 cable --> U4025QW TB4 upstream port

I am stumped. The Get Help Now team will need the diagnostic report.

@DELL-ChrisM2​ How do I get a diagnostics report from DPPM when DPPM doesn't load?

I am on to the Get Help Now team 

"How do I get a diagnostics report from DPPM when DPPM doesn't load?"

Doesn't load at all. I see. I thought the software was at least opening to the interface and just saying it couldn't connect to the monitor.

@user_46847a​ Thank you for your suggestion. The laptop was connected by the Thunderbolt4 upstream port (up to 140W EPR. I have now moved the cable to the USB Type-C upstream port (SuperSpeed USB 10 Gbps, USB 3.2 Gen 2) but DDPM still does not see it.

@DELL-ChrisM2​ DDPM only goes to this screen and the Connect button doesn't do anything... I spoke to your Get Help Now team and they said that DDPM only runs on Dell laptops and desktops, so it will not run on my Acer Predator Helios 18 laptop 

"I spoke to your Get Help Now team and they said that DDPM only runs on Dell laptops and desktops"

I have to disagree with their statement. We can see from the online DDPM 2.1.2 User's Guide that it does not specify a "Dell" computer. It states =

@DELL-ChrisM2​ Yes I know, but they wouldn't accept it. Not a very good first impression of Dell "Support"

@user_220908​ Thank you for your suggestion. The laptop was connected by the Thunderbolt4 upstream port (up to 140W EPR. I have now moved the cable to the USB Type-C upstream port (SuperSpeed USB 10 Gbps, USB 3.2 Gen 2) but DDPM still does not see it.