black screen problem

[Tushar_5]

I have the same problem but some time my laptop start and after working 1 hour it stops.I did all the efforts like external monitor connection, pressing power button for long time, new thermal paste applied on GPU and other things please any body can help if it's a motherboard then it should not open, all component i checked when laptop start for some time via BIOS menu please tell any solution

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[webworkings]

Is it just the screen going black, and the laptop itself isn't turning off? Or is it turning off as well?