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Black Screen

HP Recommended
hp elitebook folio 9470m
Microsoft Windows 10 (32-bit)


Today first my laptop audio shut off, i tried my headphones but there was nothing after I tried the my bluetooth headphone and it worked.

Afterwards when i shutdown my laptop it didnt started. I tried some of the stuff from youtube and it started but it showed an error(Cmos 502). So i guessed the I had to update the bios. 

Now when i updated the bios the laptop restarted and i knew the screen would be black for a couple of minutes but it took an hour and then I pressed the power button since then the laptop isnt turning on

when i plug the power adapter, the power button light turns on for 3 sec and than it goes black again.

Please help me out with this

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