I believe 811 DVI-D uses HDCP. I have just installed two 811 receiver yesterday, and one of them was supposed to be connected to my computer monitor (Samsung 913T). The display went blank after initial setup screen, no matter what the two installers were doing with the remote, so they told me that the box was bad and they will come back later to replace it.
After they left, I took the receiver to my TV and connected them using the RCA connection. Immediately I got the installation screen and, after completed the installation, I tested all connections from the receiver (RCA, component, DVI-D) to my TV, and all of them worked flawlessly. However, when I took the receiver back to my Samsung LCD monitor and used the DVD-D connection, it endlessly displayed "acquiring satellite signal " (message 015). I turned it on and off several times for hours, left it overnight, but it still refuses to send the program to my LCD monitor (sometimes it displayed the program for a few seconds, then came back to acquiring signal message).
I cannot think of other possible causes than HDCP. Any suggestion?