Permanent Black Screen after pressing F6(Display Off button)

Hello, someone pressed the F6 key which has the function to turn the display off. The display didn't turn on again.

The laptop was/is functioning, and can be connected to a 2nd monitor, but

Recently, after turning it off, then coming back later, I was not able to connect it to a 2nd monitor.

Things discovered when there was connection to a 2nd monitor:

• The background turned into an orange dashed black line
• There were no artifacts, or signs that the GPU is faulty.
• GeForce Experience could not updated the GPU.
• Ctrl+Shift+Windows+B(GPU Reset) worked, but now that connecting to a 2nd monitor does not work, GPU wake-up does not work(no audible beep).

I would be extremely grateful if someone could help out in how I could fix the laptop. Taking it to several repair shops said it would be too risky due to touch screen possibly being broken.

I just want to know how to disassemble it to try & re-plug the laptop screen, because that could fix it.

If you possibly know any other possible solutions, please let me know.

Thank you