I've got a Toshiba HD-A30 hooked up to an InFocus ScreenPlay 4805 by way of component video and audio is sent out via HDMI to a Sony 720. When I put a DVD in, the screen goes black but the audio works fine. I've looked at the setup menu, but everything looks ok. It appears that it's related to the HDMI. When I switch the receiver to another input not in use by the Toshiba, the picture comes on. Any thoughts on how I can fix this situation?