Unity 5 can’t preview game, says “Display 5 No cameras rendering”
here s a screenshot: Screenshot - 9fc695be82f0202aee3fd610213b8b8f - Gyazo
Pretty much as the error says, you’re previewing the output of your 5th display, but you haven’t got any cameras in the scene rendering to that display.
Did you mean to have a multi-display setup? If not, change back to Display 1 (the dropdown just under the Scene tab)