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January 2nd, 2026 21:18
U2723QE, USB-C and DisplayPort issues
Very frustrated to find that my Dell U2723QE is no longer able to connect to USB-C Display Port, for apparently no reason. It powers on and tells me it is not getting a USB signal from my computer. I tried using my work computer and home computer, both of which run Windows 11. I didn't change any settings or make any updates - this happened one evening out of nowhere. I powered off the monitor and followed the restart/reset instructions in the manual.
I've also tried using the Display Port cable that came with the monitor, into a Thinkpad dock and that doesn't work either. I tried HDMI to HDMI into the dock, and that did not work. The only thing that HAS worked is HDMI direct into my HDMI in my work laptop, so I know the monitor still works. But I need this monitor to work with both of my computers, and my personal computer only has USB-C ports. I would have to use a dock.
I have had this monitor since September 2024. I can't believe that only the HDMI input is working.
Any ideas as to how to get the USB-C Display Port input working again?
DELL-ChrisM2
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January 3rd, 2026 13:01
For direct Dell Technical Support Monday through Friday, Dell GHN (Get Help Now) chat technical support must verify the ownership and warranty status. Click the blue "Get Help Now" on the right to start a private live chat session. Share the private U2723QE Service Tag with them and all of your troubleshooting. This will in turn generate a unique Technical Support case for your unique Service Tag.
* Remove the dock from the troubleshooting
* When only connected directly to the HDMI work computer via the HDMI to HDMI cable, do the Self-Test and Built-in Diagnostics pass? See pages 88/89.
* Turn the monitor off
* Disconnect every cable (including the power cable) from the monitor
* Press the monitor power button in for 8 seconds (clears any residual power in the circuits)
* Reconnect the power cable to the monitor
* Connect the USB-C to USB-C cable to the monitor and to the USB-C computer
* Turn the monitor on. Does it work?
* Turn the monitor off
* Disconnect the USB-C to USB-C cable from the monitor
* Connect the DP to DP cable to the monitor and to the DP computer
* Turn the monitor on
* Open the Menu--> Input Source
* Choose DP
* Exit the Menu. Does it work?
(edited)
cant_keep_up
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January 4th, 2026 14:56
@DELL-ChrisM2
Thanks very much for the detailed instructions. The self-test and diagnostics work when connected directly to HDMI. The 8-second reset did not fix the problem.
[* 8-second reset]
* Connect the USB-C to USB-C cable to the monitor and to the USB-C computer
* Turn the monitor on. Does it work?
No, it still does not work after following this precisely. I purchased a new USB-C/DP capable cable (Thunderbolt 4/USB4, 40 Gb/s, 240W power delivery) in case there was a problem with the Dell cable, but both of the cables work with my other devices to send video. This seems like it must be an issue with the USB-C Port on the monitor.
I tried using the monitor source selection to test the options, but it still gives me the floating box that says USB-C cannot be detected. I also tried using the new Dell Display and Peripheral Manager, but if the screen is not connected (or if i switch source away from HDMI) then the app does not work. I don't have a device that has Display Port capability without the dock, so I can't test that port direct to computer.
Unless you have some other suggestions, I suppose I have to enter a ticket with Dell. Many thanks for your help.