Question Laptop screen won't turn on (not even in BIOS or Safe Mode) but boots to Windows and works well ?

[antony_k]

Hi, everyone.
Recently faced an issue of my screen went black and since then not able to output anything through the iGPU.

Specs:
Laptop: Asus ROG Strig G16 (2023) G614JV - - UEFI v331
CPU: Core i5-13450HX
GPU: Nvidia RTX 4060 8G
RAM: 2x16 Kingston Fury DDR5-4800

Context:
I was using my laptop projecting screen to TV (in "extend" mode) watching movies. Didn't notice when screen went off. First I do - just restart the device and saw ROG boot logo (aka Windows logo on some devices) then screen turned off and Windows Hello sounds. I've connected TV again and found the leptop itself works just well. In Device Manager identifies as normal with no error (message "This device works properly" or something like that). In Windows' Display menu it's identified as well but advanced settings says "Isn't active" and marked that Intel iGPU is being used. TV screen set as main using Nvidia GPU.

I have tried:

1. Switching project mode. Not working: project mode forced to return to "Screen 2 only" mode;
2. Pressed `CTRL+SHIFT+WIN+B` to reset graphic driver. Not working.
3. Adusted brightness. Not working.
4. Holding down power button over 60 sec. Not working: System boots longer but still nothing displayed.
5. Reinstall Intel iGPU drivers with DDU. Not working.
6. Deleted display from devices and added again. Not working.

Yesterday I got an idea to check MUX switching to `Ultimade` mode (dGPU only) and voila screen turns on. The problem: I'm still not able to enter BIOS or Safe Mode as screen triggers only on OS boot. Some strange issue with iGPU besides CPU itself works fine in heavy tasks maintaining normal temperatures as well as Nvidia dGPU. Feels like iGPU dies but CPU is good.
Appreciate any help on identifying the problem and fixing if possible so.
Cheers.