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HDMI output stopped working on HP Pavilion

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HP Pavilion 15-cs3900nc
Microsoft Windows 10 (64-bit)


I have an HP Pavilion 15-cs3900nc laptop which is 9 months old and have been plugging it into external monitor  via the HDMI output. Everything was fine , but from yesterday monitor  it doesn't work.



Looking at the display settings, when I plug the HDMI cable in, the display settings change, so the laptop knows another monitor attached. 


I've tried 3 different HMDI cables and also TV, so the problem is the computer. I was worried it's a hardware failure, but hardware drivers looks ok. I tried also another input thrue C input. It doesn´t also function.


I uninstalled the display driver and deleted the files, rebooted the machine and installed the driver again, I also instaled latest version of BIOS, windows 10 an all updates.



The machine detects there's a 2nd monitor present when the cable is plugged in. Both monitors appear in device manager and in display settings, And the Win+P shortcut brings up the options to direct o/p to internal display, external, mirror or extend, but the external screen remains blank.



Anybody have any ideas what to do ?

Thank you.


HP Support Agent
HP Support Agent
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Message 2 of 3
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Hi@Lada7, Welcome to the HP Support Community!


Thank you for posting your query in this forum, it's a great place to find answers.


I reviewed your post and I understand that the HDMI port is not working after a windows update.


Don’t worry, I assure you I will try my best to get this sorted J


Awesome job on diagnosing the issue correctly and performing smart troubleshooting before posting your question on HP forums. Kudos to you on that score.


I recommend you to update the bios and the chipset driver from the below link and check if it helps.


If the issue persists, please check and install all the windows updates and check if it helps.


Let me know how it goes and you have a great day!


Please click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution.

Click the “Kudos, Thumbs Up" on the bottom right to say “Thanks” for helping!

Have a great day! 

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HP Support Agent
HP Support Agent
2,989 2,988 110 148
Message 3 of 3
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This message is from the HP Support team, 


Just needed to know if all your queries were resolved? 


If not, I could help you get there. 


If you would like to thank us for our efforts to help you, go to the public post & give us a virtual high-five by clicking the "Thumbs Up" icon below, followed by clicking on the "Accept as solution" on my public post. 


Have a great day ahead! 

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