I felt very smug when I used the HDMI inputs of my SP3 for an Oppo, Fire TV, and Mac Mini with the HDMI output going to the projector, and it all worked. The next day, I fired up the setup and pressed the DVD button on the remote, nothing. Tried the next buttons, nothing. On subsequent attempts, I sometimes got a picture but no sound. I finally reconnected HDMI-1 from the Oppo 105D directly to the projector and HDMI-2 to the first HDMI input of the SP3, and that has continued to work fine. I don't understand what's going on when I try to use the SP3 to switch between HDMI inputs.