WIndows 10 Screen turns off but turns on when external monitor plugged in

h3donyst

Member
My Asus notebook is behaving strangely, sometimes when starting, screen turns off or during startup doesn't turn on at all. I can hear programs starting up and I can see it trying to turn on. It doesn't flicker or slowly fading it just goes to black and I can see it trying to light up. This occurs occasionally not every time.
When this happened I tried plugging in external monitor and everything went back to normal.

Is this a software or hardware (GPU, screen, power) issue?
 
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