Just a quick question, ThePrisoner..
Have you hit the "OUTPUT RESOLUTION" on your BDP-51 remote?
Cycle through it.. wait about 15 seconds after each hit of the button...
If it's on an incompatible setting or wrong output (component vs hdmi) it won't output to the display.
I know once playing with it when it was new I did this and drove myself crazy for about 20 minutes because nothing would show on the display.