The touchscreen doesn't work

[Dm771]

There's a problem with the touchscreen. It just doesn't work. In Device Manager  Human Interface Devices it just doesn't exist

I disabled the Intel  HD 4600 graphics card, and on a different NVIDIA GeForce 840M graphics card, the touchscreen worked.

But the sensor device never appeared in the HID

I rebooted my laptop and the display touch stopped working again. I closed the laptop lid, opened it, turned it on, and the screen touchscreen worked again.

Then I rebooted the laptop again and pressed F2 at startup. I entered the diagnostics program, and this time the touchscreen showed up in the tests. I successfully closed all the blocks, but dragging wasn't as successful. I could drag, but an error appeared in the test.

[Hawks_Eye]

Hi @Dm771 

Welcome to the HP Support Community! 

"We regret to announce that HP has suspended all support services in Russia. Given the current environment and long-term outlook, If you are currently in possession of an HP product, please contact your nearest retailer for more information about how to repair, return or replace it. 

We would like to thank all of our loyal customers for their continued support over the years, take care and stay safe."

Regards,

Hawks_Eye