none working dispaly screen

Hello,Dispaly screen not working you start lap top HD and powers up but screen dose nothing. IDEAS ????? it is a GATEWAY NV53
It went ut after watching a NETFLIX stream and unpluging the HDMI cord laptop screen wen black and not been back.
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More about working dispaly screen
  1. switch the laptop from external monitor back to the screen. FN+F4
  2. That did not work.....
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