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January 5th, 2026 14:30
27 All-in-One EC27250, Dell OSD stopped functioning
I have Dell all in one PC. I also have a laptop connected to the AIO via an HDMI port. I use an OSD button to switch the input sources (PC and HDMI), and everything worked until I have installed several updates on Saturday. 4 updates were pushed by Dell, including a BIOS update, and one update came from NVIDIA (driver/app update). There were no Windows updates or any other updates, and no hardware changes. All updates were successful, the AIO had to reboot and was functioning normally. However, the OSD button is no longer working - it does not switch inputs. If I shutdown the AIO PC, the screen automatically recognizes the HDMI port, and I can use the laptop; if I turn on the AIO PC, it boots normally and I can use it, but I can't switch to the HDMI port (laptop). I tried to cold reboot the AIO (power off the system); I tried to reinstall the DELLOSD application (downloaded from the Dell support site), and spent considerable time with Dell support (who asked me to do the same things - reboot, install the DELL OSD app, check the cables, etc.) - nothing helps. The only odd thing I have noticed is that the icon in Control Panel named "DELLOSD" is greyed out and when I click on it says that this function is not associated with any application. I noticed that Dell OSD process and service are running.
Can anyone please help? The support representative suggested that my next step should be to start rolling back the updates that were previously installed, and I'm hesitant to go this route. I think (and may be wrong) that this should be something trivial that I am missing. Thank you!
P.S. I forgot to mention that the OSD button used to work properly prior to yesterday for long time and I had no problem switching inputs.
DELL-ChrisM2
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January 5th, 2026 16:32
Our users need more data before they can correctly troubleshoot. Reply with the specific Dell Inspiron Desktop model.
GVZ-54
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January 5th, 2026 17:40
@DELL-ChrisM2 - thank you for the quick response! My Dell AIO model is "Dell 27 All-in-One EC27250". Also, I forgot to mention - as part of the diagnostic process:
1) I ran all the hardware diagnostic tests by Dell SupportAssist; all tests passed
2) I logged into BIOS to make sure that the OSD is enabled; it is enabled
Thanks again for your help!
DELL-ChrisM2
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January 5th, 2026 17:51
@GVZ-54
While awaiting other user troubleshooting idea, 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 Service Tag with them and all of your troubleshooting. This will in turn generate a unique Technical Support case for your unique Service Tag.
GVZ-54
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January 5th, 2026 18:07
@DELL-ChrisM2 - thanks. I already did this yesterday, and have spent considerable time on chat with a Dell representative. The issue remains unsolved, and the best suggestion I have received is to start rolling back the updates that were installed. I hope that I can find a better solution on this forum. My suspicion is that the OSD application that I was told to install by the Dell representative does not work properly or needs additional configuration, but I may be wrong.
Alan1ace
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January 6th, 2026 19:10
I’m experiencing the same issues you’ve described, although I’m using the 24" EC24250 model. Everything was working fine before I applied the updates, but as it was a new device, I went ahead and installed the full set of updates. Notably, I also installed the Firmware/BIOS update.
I’m inclined to think this update is the cause, as you mentioned the OSD app which wasn’t updated. I did reinstall the OSD app just in case, but it made no difference. Like you, I’m reluctant to roll back the Firmware/BIOS update, particularly as it’s locked within the BIOS.
I’ve also tried disabling and re‑enabling the OSD in the BIOS, but no luck there either. I’m now waiting for a new Firmware/BIOS update in the hope that it resolves the issue.
I’m a little disappointed that Dell’s quality control allowed this to be released to the public. I suspect there are further issues with this version of the Firmware/BIOS, as the USB ports continue to supply power even when the computer is switched off, despite the setting being configured to disable USB power.
Another frustration with this product is the lack of volume control for external devices. You can adjust the volume if you’re using a laptop, but if you connect something like a games console, you’re stuck with the default output level — unless I’m missing something. It seems odd that volume options weren’t included on the physical buttons.
Let’s hope they sort it out soon.