There are a lot of possible reasons for this. You might be behind a wall, or under the floor, or on the wrong side of a scene dome. You also might be in the wrong environment mode, such as scene only, interior lights turned off, or maybe not rendering in iray. My first suggestion would be to go to the editor tab and hit the default button, and then check the environment tab in the render pane. When I get the black render, it's almost always because of wrong lights, environment, or I'm under the floor. What it's usually not is the product. (like never, at least for me, I have had problems with hair, but again, it was me on the wrong version of Daz).

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Wolfenshire, Moderator/Community Leader