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.
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