HDMI port not working?

[gunnie]

I have had this desktop for about 4 months and have been loving it.  I also purchased a 2nd monitor, and everything has been working well together until about 2 weeks ago.  The 2nd monitor quit working a couple of weeks ago, & it says, "No HDMI signal from your device"  I found an old post, "HDMI Port Not Working After Windows 11 installation", & even though Windows 11 was already installed on my pc,  I have been going down the list of what was recommended.   I got down to Device Manager in the response, and when I clicked on the Intel (R) UHD Graphics, it showed:  "Windows cannot verify the digital signature for the drivers required for this device. A recent hardware or software change might have installed a file that is signed incorrectly or damaged, or that might be malicious software from an unknown source. (Code 52)"  Could this possibly be the reason for my monitor no longer getting a signal from my pc, & if so, how can I fix this?  I hooked this monitor to a laptop & it worked fine, so I know it's not the cable.  Could it be the port itself?

[Deep_World · Accepted solution]

Hi @gunnie,

Welcome to the HP Support Community!

Thanks for reaching out!

We're thrilled to have the opportunity to assist you and provide a solution.

I’m sorry you’re going through this; I understand the concern and don’t worry I’ll help you with this.

Did this issue start after a Windows update or driver update about two weeks ago?

Is the HDMI port completely unresponsive (no detection at all), or does Windows at least recognize a second display but fail to output?

Have you tried reinstalling or rolling back the Intel UHD Graphics driver yet?

Here are some troubleshooting steps worth trying:

• Reinstall graphics drivers: Go to Device Manager → Display adapters, right‑click Intel UHD Graphics, and uninstall the device (check “Delete the driver software” if available). Then restart and let Windows reinstall automatically, or download the latest driver directly from HP’s support page for your desktop model.
• Check Windows Update history: See if a recent update coincides with when the issue started. If so, rolling back that update may help.
• Disable driver signature enforcement temporarily: Boot into Advanced Startup → Troubleshoot → Startup Settings → Restart → press F7 to disable driver signature enforcement. If the monitor works afterward, the issue is with the driver signature and reinstalling a proper signed driver should fix it.
• Test with another HDMI device: Plug a different monitor or TV into the same HDMI port to confirm whether the port itself is functional.
• BIOS/firmware update: Check HP’s support site for BIOS updates, as some include fixes for display output issues.
• Try a different output port: If your desktop has DisplayPort or another HDMI port, test those to rule out a single‑port failure.

When you look in Device Manager, does the Intel UHD Graphics adapter show a yellow warning triangle, or is it completely disabled? That detail will help confirm whether the driver signature error is the main issue or if the port itself might be failing.

I hope this helps.

I'm glad I could help! 😊 If this resolved your issue, please mark it as "Accepted Solution" and click "Yes" on "Was this reply helpful?" Your feedback not only keeps us going but also helps others find the solution faster! 

Take care and have an amazing day ahead! 

Best regards,

Deep_World