Not all USB-C ports support video output. You should check the specifications on your particular model.

Only USB-C port with USB 3.1 or above version can stream video.

Answer from Craig Long on learn.microsoft.com
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Reddit
reddit.com › r/usbchardware › usb-c to hdmi suddenly stopped working
r/UsbCHardware on Reddit: USB-C to HDMI suddenly stopped working
September 27, 2023 -

I have been using an HDMI cable + HDMI to USB-C adapter to connect two monitors to my laptop. My main monitor is directly plugged in to the HDMI-socket, and the USB-C adapter to the only USB-C socket on the laptop. It's been working flawlessly until yesterday. Now the second monitor just displays "No HDMI signal" and goes to sleep mode. It does not even recognize me plugging in the USB-C cable. Take note that I've done zero (0, nil, no) changes to my setup.

Naturally I thought that the adapter was faulty since I did some testing with the USB-C socket (it charged my iPhone), and the HDMI-cable was working. Purchased a new HDMI to USB-C cable but to no avail.

On my laptop the device manager shows my monitor as a "BillBoard Service".

Has anyone run into this problem? Google is not my friend in this matter, even though I am a man of lurking the internet. Can someone point me in the right direction here?

Many thanks.

Edit: Okay so it got solved by turing the laptop off, then holding the on button for 30 seconds and letting go. What this triggered I have no idea but it might help someone out.

Top answer
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This is the first post I've found with this problem! I have the same set-up; a Dell laptop with HDMI port and two USB-C ports. HDMI port connects to an external monitor, one USB-C connects to a power supply, the other to an external monitor with a USB-C to HDMI cable. The USB-C ports are interchangeable as to function. This works fine most of the time, but sometimes when I boot it, the USB-C-connected monitor doesn't get a signal. "Display Settings" shows all 3 displays, but the misbehaving one is shown smaller, and listed as "Disconnect this display". Changing the dropdown box doesn't work. It won't change from "Disconnect this display". This only seems to happen at boot time. I've switched monitors, switched USB-C ports, even bought a USB-C to DisplayPort cable, but the issue pops up randomly anyway, so I'm pretty sure it is not a hardware problem. Most days it works fine, but some days it just doesn't. This is a work-issued laptop, on which I do NOT have administrator privileges, so updating drivers or mucking with the BIOS is out of the question. Since it isn't reliably reproducible, and I work from home, getting the company's IT department involved would be an exercise in futility. The only ways I've found to fix it are to reboot, or to superstitiously flip the USB-C connector over a time or two. I am a software engineer and electronics technician, so I have some small expertise. I believe the display driver is to blame, but I can't prove anything. I think there's some boot-time sequence that doesn't always go just right. FWIW, my display adapter shows as Intel(R) Iris(R) Xe Graphics, Driver Version 31.0.101.3959. It's very frustrating and annoying when it happens, but I don't have any better solution than this.
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Dude, I had the exact same problem and I tried your solution and it worked! Thank you so much! Now I’m curious what caused it as well. I know I recently updated my GeForce drivers so maybe after certain updates you have to do a hard reset?
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Microsoft Learn
learn.microsoft.com › en-us › answers › questions › 4291173 › usb-c-to-hdmi-adapter-doesn-t-work
USB-c to hdmi adapter doesn’t work - Microsoft Q&A
Top answer
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Not all USB-C ports support video output. You should check the specifications on your particular model.

Only USB-C port with USB 3.1 or above version can stream video.

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Hi Lucy. I'm Greg here to help.

I see a lot of reported issues with USB-C to HDMI adapters, in fact any adapters for monitors in Windows are very likely not to work for many reasons because the native method is always much, much better.

But you can troubleshoot USB-C to HDMI monitor connections not working to see if one of these fixes work - I've collected them all:

https://sortatechy.com/usb-c-cable-with-monitor/

https://www.partitionwizard.com/partitionmanage...

https://usbcafe.com/usb-c-to-hdmi-not-working-s...

https://uniaccessories.com/blogs/blog/solved-us...

https://www.youtube.com/watch?v=7IRLYIXz2TA

Feel free to ask back any questions. If you'll post back detailed results then I may know what to suggest next, if necessary.

______________________________________________

Standard Disclaimer: There are links to non-Microsoft websites. The pages appear to be providing accurate, safe information. Watch out for ads on the sites that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the sites before you decide to download and install it.

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HP Support
h30434.www3.hp.com › t5 › Desktop-Video-Display-and-Touch › USB-C-to-HDMI-Isn-t-Working › td-p › 8933207
Solved: USB C to HDMI Isn't Working - HP Support Community - 8933207
December 7, 2023 - Here's a step-by-step troubleshooting guide to help you identify and resolve the problem: Ensure that both ends of the USB-C to HDMI cable are securely connected to the respective ports on your devices (e.g., laptop and monitor/TV).
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Selore
seloreglobal.com › blogs › selore › troubleshooting-usb-c-to-hdmi-adapter-issues-a-comprehensive-guide
Troubleshooting USB C to HDMI Adapter Issues: A Comprehensive Guide – Selore
Check USB C and HDMI connections, ensuring they are properly inserted. Learn how to connect the adapter to devices and external displays correctly. Sometimes the USB C port on the device is unresponsive, causing problems with the connection between devices. Check if the USB C port is working properly. If it works well, proceed with the following troubleshooting steps. Otherwise, try connecting the adapter to an alternative port. If your adapter is not working properly, another potential reason could be that the HDMI port is not compatible with the adapter...
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Cabletime Tech
cabletimetech.com › home › knowledge › knowledge
Troubleshooting USB-C To HDMI Adapter: Tips for Fixing This Common Issue
December 13, 2023 - To narrow down the cause of the problem, try connecting the USB-C HDMI adapter to another compatible device. This procedure allows you to determine whether the problem is in the adapter itself or in a specific device to which you initially connected. If other devices recognize the adapter and work correctly, the problem may be related to the settings or compatibility of the original device.
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Mokin
mokinglobal.com › home › mst hub › usb c to hdmi hubs not working -- how to fix?
USB C to HDMI Hubs Not Working -- How to Fix?
October 18, 2024 - Click on “View optional updates” and then click “Download & install.” to install any available updates. Once the drivers are installed, restart your device and see if it works well. Most users have reported that their USB C to HDMI connections ceased functioning after the recent Windows 10 update.
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uni
uniaccessories.com › home › blog
[Solved] USB C to HDMI Adapter Cable Not Working in 2023 - uni
It might be the adapter went down, the HDMI to HDMI cable is not good quality, the HDMI cable length is over 15ft, or the display goes faulty on refreshing rate(even without any other connection), and there is also a slight chance that the host ...
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Vcom
vcom.com.hk › shows › 169 › 438.html
How to Solve USB C to HDMI Adapter/Docking Not Working - Blog - - VCOM International Ltd
Verify that the USB-C port supports video output: Check your device’s specifications or user manual to confirm that the USB-C port supports DP Alt Mode. On many laptops, this information can be found in the technical specifications section of the user manual or on the manufacturer’s website.
Find elsewhere
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Dockteck
dockteck.com › home › troubleshooting usb-c to hdmi adapter: tips for fixing this common issue
Troubleshooting USB-C To HDMI Adapter: Tips for Fixing This Common Iss – Dockteck
We suggest conducting online research to discover the best HDMI adapter for your devices. Try switching on and off your phone and device while the connection is established. The action will restart the connection and eliminate compatibility if any.
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Microsoft Learn
learn.microsoft.com › en-us › answers › questions › 4119805 › usb-c-connector-device-not-working-for-hdmi-extens
USB-C connector device not working for HDMI extension. - Microsoft Q&A
Top answer
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Hi Mridul karat palliyath,

Welcome to Microsoft Community.

I'm Hahn and I'm here to help you with your concern.

I'm sorry to hear that your USB-C HDMI connector is not working properly. It sounds like you have a driver issue or a hardware compatibility problem. Here are some possible solutions that might help you fix the error:

Fix USB-C problems in Windows - Microsoft Support

Error codes in Device Manager in Windows - Microsoft Support

  1. Update Drivers: Make sure you have the latest drivers installed for your USB-C HDMI connector. Sometimes, compatibility issues can be resolved by updating or reinstalling the device drivers. Visit the manufacturer's website and download the latest drivers for your specific device and operating system.
  2. USB Port: Try using a different USB-C port on your computer. Some USB-C ports might have different capabilities, and using a different port could potentially resolve the issue.
  3. Firmware Update: Some devices, especially USB-C adapters, may require firmware updates to ensure proper functionality. Check if there are any firmware updates available for your USB-C HDMI connector and follow the manufacturer's instructions to update it.
  4. Uninstall and Reinstall Drivers: In the Device Manager, you can try uninstalling the problematic drivers, disconnect the USB-C HDMI connector, restart your computer, and then reconnect the adapter. Windows might automatically reinstall the drivers, potentially resolving any conflicts.
  5. Disconnect Other USB Devices: Disconnect any unnecessary USB devices from your computer. Sometimes, conflicts can arise when multiple USB devices are connected simultaneously.

Remember to back up your important data before making any significant changes to your system. It's also a good idea to test the USB-C HDMI connector on another computer to further isolate the issue and determine whether the problem is specific to your computer.

I hope this helps.  If there is anything not clear, please do not hesitate to let me know.

Your Sincerely

Hahn - MSFT | Microsoft Community Support Specialist

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Windows Report
windowsreport.com › fix › laptop & pc › usb to hdmi adapter not working
How to Fix USB-C to HDMI Not Working Windows 11
May 14, 2025 - If your USB C to HDMI is not working, it might be related to your driver or the USB port. Updating the driver or switching ports should help.
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MiniTool Partition Wizard
partitionwizard.com › home › partition manager › top 5 solutions to usb to hdmi adapter not working
5 Easy Solutions for USB to HDMI Adapter Not Working
November 28, 2024 - If you find the USB C to HDMI adapter not working issue, the issue may be related to a dedicated driver.
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Apple Community
discussions.apple.com › thread › 255156987
iPhone 15 Prox Max USB-C to HDMI Issue - Apple Community
After connecting the iPhone to the USB-C to HDMI Cable, go to settings —> display. It will show options for both the iPhone screen and for the external display. Then go to the external display and select SDR Mode. It should work fine now. For some reason, the other options (HDR or Dolby) might be selected and will not work.
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HP Support Community
h30434.www3.hp.com › t5 › Notebook-Video-Display-and-Touch › USB-C-to-HDMI-not-working › td-p › 6370517
Solved: USB C to HDMI not working - HP Support Community - 6370517
February 26, 2019 - The USB-C was working, the adaptor was detected, but no HDMI image. At that time I had to format the computer, and the problem persisted. Now it happened the same on the right one: usb seems to work, but the hdmi doesn´t. So, do you think it´s a problem with the adaptor not being with ALT MODE?
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Dell
dell.com › dell community › laptops › locked topics – laptops general
USB-C to HDMI not working | DELL Technologies
May 16, 2017 - USB-C outputs only provide native DisplayPort. From there, it's up to the adapter to convert to another signal type if desired, such as VGA or HDMI. That is not something that the host PC would have any control over or even be aware of. Consequently, if VGA is working fine, that indicates that the system is providing a display output signal to the adapter, so if HDMI is the only problem, that suggests a problem with the adapter.
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Plugable
support.plugable.com › usb docking stations › ud-ultcdl
No HDMI signal from USB-C docking station (used to work) - UD-ULTCDL - Plugable Support
March 4, 2019 - All of a sudden, I’m having troubles connecting my monitors to my plugable USB-C docking station. I have a HP Spectre Notebook (Win10) and used to connect 2 external moniors (also HP) via HDMI to the docking station (UD-ULTCDL) to have 3 displays in total without any problems. Everything worked ...
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Mokin
mokinglobal.com › home › hub & adapter › [solved] usb c to hdmi adapter cable not working
USB C to HDMI Adapter Cable Not Working - how to fix it
October 27, 2025 - For Windows users, if your USB-C to HDMI adapter does not work, the issue maybe connect with dedicated driver.In order to solve this issue,we suggest you update the USB to HDMI driver on the official website.Alternatively, recently installed ...
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YouTube
youtube.com › watch
Troubleshooting Guide: USB C to HDMI Adapter Cable Not ...
Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.
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USB Cafe
usbcafe.com › usb-c-to-hdmi-not-working-solved
SOLVED: USB-C to HDMI Adapter Cable Not Working (2023) – USB Cafe
If you are able to verify that all the 4 ports of the USB C are functioning optimally by being able to supply DP Alt Mode, then check to be sure the HDMI to HDMI cable works fine and if so, then you will have to replace the USB-C to HDMI Adapter.