I've just bought a new Denon receiver (AVR-2113), and everything connects perfectry (Blu-ray, cable, TV), except my computer (from my ATI HD4850 DVI - with a HDMI converter from ATI and a HDMI cable). No matter what entry point I'm using, I only get black screen and no sound.
If I try to connect the HDMI cable directly to my TV, everything works fine, but off course - only with sound from the TV.
I doubt the problem is the receiver, because it should work "out-of-the-box". If I swap the HDMI cable with a working unit, I get black screen and no audio - swap back and the units picture+sound is back. If I swap with the TV's input I get the PC screen and sound.