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OMEN by HP 16.1 inch Gaming Laptop PC 16-wf0000 (755G1AV)

I was working with extertal monitor as well. Suddenly during working, laptop screen goes black and after few seconds came back. But again happen 2 times more, then completely blank. And I noticed that my keyboard also not working, not a single key. But other screen was working fine with mouse. 

 

I restarted and connect external keyboard, then enter password. I was not able to see my laptop screen, but just enter my password. Then second screen working fine. 

Then I shutdown my laptop. Now I am unable to do anything, because I can't power on my laptop, because power key is not working.

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