What is the corrective action for a black screen?

Depends on your connection. If it's a red, blue and yellow. Check the yellow and make sure it in the right spot. Give the wire little wiggle at both ends. Check for a short. Also. Check that you have them in the inputs. You'll be surprised on how often that little mistake happen even to the best of us. (Outputs to inputs and inputs to outputs) lol. This work with composite too. Now if its an hdmi connection. Try giving the connection little wiggle. It might be getting a bad contact. Or if you repeatedly disconnect you could of worn-out the connection and/or cable. Oh if rca can also get worn-out to.