Windows 10: Gaming Laptop Screen Black When Connected To External Monitor.... Any Fixes For This Issue?

Hello Microsoft & Others,I currently use a ASUS Rog Strix G15 and have it connected to an external monitor which is an Acer monitor. Every time I turn on my laptop the screen is black while the monitor is showing the gaming laptop screen and I am confused on why this is happening. Both devices are connected with an HDMI cable and when the cable is taken out the gaming laptop screen is still black. I have restarted and updated my graphics card multiple times and yet nothing has changed. Even when I decide to change the project setting which is stuck on "PC screen only" nothing changes when

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Laptop screen will only work once it has been connected to an external monitor, even if that monitor is switched off

Having an issue whereby I cannot see or use the Laptop screen without first plugging it into an external monitor.

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  Upon Windows startup unconnected to any external monitor
  
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    DELL opening logo can be seen on Laptop screen
    
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    Screen goes black with backlight
    
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    Mouse pointer can be seen onscreen if moved to the right, as though a second monitor is connected on the left hand side.
    
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    Attempting to press enter and type in password in the correct order as though the screen was functional does not do anything
    
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  Upon connecting to an external monitor (even if switched off)
  
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    Laptop screen will suddenly appear, all functionality restored
    
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  Upon disconnecting again from external monitor
  
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    Laptop screen remains visible and functional
    
  • 
    Lock screen /unlock screen no problem
    
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  Upon shutting and opening the laptop lid
  
  • 
    Screen black with backlight, same results as windows startup, mouse pointer can be seen and moved as though a second screen is connected on the left
    
  • 
    No functionality until reconnected, even for a second, with an external monitor.
    

Troubleshooting:

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  Restarting multiple times, checking multiple display screen is not activated:
  
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***Post moved by the moderator to the appropriate forum
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Surface Laptop 3 with external monitor

Hi All,

Has anyone come across an issue with an external monitor blacking out while connected to a Surface Laptop 3? I have the laptop connected to a widescreen laptop with the Surface Dock. Both work fine however, once every hour or so the external monitor blacks out and comes back.

I've completed the following:

• Updated laptop drivers and firmware
  • Updated monitor drivers
  • Swapped out monitor

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Why does my laptop go black after connecting to external monitor?

Everytime i connect my external monitor to my laptop by usb my laptop screen goes black and my external monitor freezes. When I disconnect it (and reconnect it) my laptop stays on a black screen and my external screen too.

To fix it ive been shutting down my computer and restarting it with my external monitor connected to it but i know thats not good for my computer and im really annoyed.

My laptop is only 2 years and 2 months old and i still use windows 10 because ict told me to.

So does anyone know how to fix it?