Why does my screen go black and I have to turn it back on again?

when I leave my computer screen and dont do anything it goes black the I have to restart even though the lights are still on ,I used to be able to touch any key and my screen would come back on.
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More about screen black turn back again
  1. Power management. Do not put computer to sleep.

    or

    Device manager. Enable keyboard to wake computer up.
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