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Troubleshooting black screen issues on HP Notebooks: Click here to view the instructions!
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‎05-30-2025 12:24 AM

HP Recommended
Product: HP EliteBook 840 14 inch G10 Notebook PC (6V5W7AV)

Hi,

I use my laptop with two different monitors (on two different places) via Thunderbolt (USB-C) as both monitor and docking station. From one day to the next, no image is transmitted anymore - although charging, audio, and USB devices connected to the monitor still work perfectly. Only the video signal is missing. I’ve tested this with three different monitors. Same everywhere. Tested some BIOS stuff, but no success.

As a workaround, I’m now using an additional HDMI cable for the video signal, which is rather inconvenient. Can you help? Thanks!

1 person had the same question
2 REPLIES 2

‎06-01-2025 03:43 AM - edited ‎06-27-2025 07:29 AM

HP Recommended

I have to correct the description: Audio is also transferred via the HDMI cable. The USB-C cable connects only usb devices and delivers power.

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‎06-27-2025 07:28 AM

HP Recommended

The only thing that actually worked was completely draining the battery.
After restarting the laptop, the Thunderbolt 4 (USB4) port started working properly again.

I stumbled upon this "solution" more or less by accident – but it did the trick.


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