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Black screen, secondary screen works. Can't find the issue for the primary one.

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Laptop involved:Asus ROG Strix GL553VW-FY079T
Situation: I was booting (succesfully) on Linux on a USB drive which hosts my work environment.
After a few reboots while trying different boot settings in the BIOS (kept putting the bootable USB in the wrong USB slot and it would not show up), the screen simply went dark. Both when booting from Linux and from the original Windows.

Symptoms:
-Screen is dark, no bios, no windows, nothing. I do see it 'light up' though so it is not a power issue. It simply does not seem to receive a feed.
-Connecting a secondary screen, I can (blindly) log into windows and have a full working computer when using the secondary screen. Except for the primary laptop screen that is.
Keyboard, keyboard lighting, touchpad all work.

Stuff I tried:
-Reset the BIOS settings to default (I did this by googling a guy doing it, then following his exact actions and the reset worked)
-Reset the CMOS battery, including disconnecting the main battery and waiting for about 15 minutes
-While under the hood, checked all physical connections. I don't really think it's a hardware thing, as one moment all was well and the next without any physical alteration the screen went dark.

When in windows (actions performed on secondary monitor)
-Reinstall graphics driver
-Reset Windows
-Reinstall graphics driver again
-Make the nvidia card the default gpu for all actions (thought the Intel graphics thing might be the issue)


Suspicion:
As the problem occured while changing settings in the BIOS, I feel like the problem might be here?
Then again, I resetted it to default BIOS settings which worked just fine before.

I pray to the binarygods and you guys that I will find a solution, the laptop is still too solid otherwise to get rid off!
 
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Sounds like either the screen on the notebook has failed or the video cable from the MB to the screen has become detached or is damaged.

Have you tried shining a flashlight into the screen in a darkened room to see if you can see any Windows desktop icons in the background.
 
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