I'm assuming the monitor uses HDCP. My upscaling DVD player works on the monitor and it requires HDCP. Also, the Samsung box states it uses HDCP. And this document also verifies it.
I updated my Blu-ray player's firmware, but that had no effect. I also switched cables and set the player's output to 720p with no effect. Is there another setting that I could be missing?
DVD’s are native 480i. Is your upscaling DVD player scaling to 480P, 720P, 1080i, or 1080P? Try setting your Blu-ray player to 480i or 480P. It might just be a handshaking issue between the Blu-ray player and the Samsung monitor. It sounds like you are getting no picture at all. The solution might be to purchase another brand of Blu-ray player that will not produce the same handshaking problems.
Also verify your Blu-ray player HDMI output is working by connecting it to another HDMI display.