HP laptop HDMI not working

If it doesnt see it in Device Manager, try Win-P and/or detecting it manually. Next step would be nuke the display driver and re-install with second monitor connected.

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Best Answer

I'm not sure from the post whether you've tried this, but you should find something with HDMI input and see if the laptop can display there before you blame the HDMI port. I'm not familiar with the laptop you bought, but it's possible it doesn't support sending an analog signal out the HDMI port, so if you're using a simple adapter cable, it wouldn't work - in that case you would need an actual converter to take the digital HDMI signal and turn it into an analog VGA signal. I'm surprised HP didn't include a mini-DP port for converting to other video outputs.

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Copperskull wrote:

I'm not sure from the post whether you've tried this, but you should find something with HDMI input and see if the laptop can display there before you blame the HDMI port. I'm not familiar with the laptop you bought, but it's possible it doesn't support sending an analog signal out the HDMI port, so if you're using a simple adapter cable, it wouldn't work - in that case you would need an actual converter to take the digital HDMI signal and turn it into an analog VGA signal. I'm surprised HP didn't include a mini-DP port for converting to other video outputs.

Sorry, I should have clarified - It was working fine up until last Friday, no issues for a couple of months, and then suddenly it seemed to just stop working. We use this same setup [HDMI>Adapter>VGA>Monitor] setup on plenty of similar devices [same laptop, and in some cases same monitor model] without issue.

I've just tried a direct HDMI to HDMI connection and that's worked fine as you say - odd that through an adapter it isn't seeing it, when so many other users don't have an issue...

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I have a Dell Precision where HDMI-VGA works fine on first boot but if the computer goes to sleep the second monitor will not come back up without unplug/replug on the adapter. Finally surrendered and just connected it HDMI ... apparently the adapter knows new but not how to re-establish existing in my case.

If it stopped working - Id go through the update history and see if the display driver was updated around the time this started.

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RoRulon wrote:

Copperskull wrote:

I'm not sure from the post whether you've tried this, but you should find something with HDMI input and see if the laptop can display there before you blame the HDMI port. I'm not familiar with the laptop you bought, but it's possible it doesn't support sending an analog signal out the HDMI port, so if you're using a simple adapter cable, it wouldn't work - in that case you would need an actual converter to take the digital HDMI signal and turn it into an analog VGA signal. I'm surprised HP didn't include a mini-DP port for converting to other video outputs.

Sorry, I should have clarified - It was working fine up until last Friday, no issues for a couple of months, and then suddenly it seemed to just stop working. We use this same setup [HDMI>Adapter>VGA>Monitor] setup on plenty of similar devices [same laptop, and in some cases same monitor model] without issue.

I've just tried a direct HDMI to HDMI connection and that's worked fine as you say - odd that through an adapter it isn't seeing it, when so many other users don't have an issue...

In that case, I agree withkevinhughes2​. Try reinstalling or rolling back the display driver to see if it changes anything. It may just be stuck on a certain type of secondary display and refuses to detect what output it should be using.

• kevinhughes2

  Datil

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So it's started working again now, as perCopperskull​'s suggestion, I connected the laptop to a monitor with a direct HDMI>HDMI connection, and it immediately found it and began outputting to it, which makes sense. Then I connected the HDMI/VGA adater setup back into it, and it started seeing the second monitor again through that setup! Absolutely baffling, but it seems to have fixed it, it's working fine now *shrug* it's nothing I've done, between making this thread and now it's just sat on my desk in sleep mode XD

On a side note I've been pushing for a budget to replace our monitors with HDMI compatible ones, and the same models across the board for consistency what with most of our computers being G7s and only having HDMI ports, but so far no go :[

Thanks for your suggestions! :D

• Copperskull

  Jalapeno

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Software and drivers for HP 250 G7 Notebook PC

You may have bad or lose contacts on your cables, defective HDMI - VGA adapter, faulty VGA input on the monitor, incorrect input set on the monitor, and so on.

But certainly HDMI output on the notebook is fully functional.


Update BIOS, firmware and drivers.
Check cables and HDMI - VGA adapter by testing them on another system.
Set manually input on the monitor to VGA.

Disable/uncheck in Windows "Turn on fast startup [recommended]"
You can do it via Control Panel, registry or GPO.
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Power]
"HiberbootEnabled"=dword:00000000

Add TMM Transient Multimon Manager UseIViewHelper into registry
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\TMM]
"UseIViewHelper"=dword:00000000

You need to enable monitor manually in Windows in some instances when adapter is used to connect the monitor.
HP PCs - Using Two or More Monitors with One Computer [Windows 10, 8]
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• RoRulon

  Tabasco

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