The thing to discover is, is this only a screen or video issue, or a windows issue.
I have one laptop that does this, whenever I move the laptop screen it will often go totally black (no signal). Then I have to move it back and forth a bit, cross my fingers that I have it angled "just right" and then use the function key that turns the screen off and on again to reset it (maybe what you are achieving with restart). Some loose cable I guess. It's a PITA to work on laptop screen cables so I just live with this.
Anyway, for me this is just a screen issue. If I was playing a game or a video, the sound continues. Maybe you can try the same?
If this doesn't describe your issue at all, try reinstalling the video driver from HP ?
Also look in Windows system event log to see if there are any messages that relate to some video error?
I keep that one plugged into an external monitor, keyboard and mouse so it's not an issue.
If you have access to the same, you could see again if it's a hardware screen problem only or else something within Windows or a further hardware issue, as if only a screen issue the external monitor would keep displaying and laptop would continue to be usable.
All LCD screens have a backlight, since liquid crystals have no luminescence. To tell if this is the case, shine a bright light on the screen when it’s gone black. If it’s a failed backlight, you’ll be able to see a faint image of what should be on the display.
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