It doesn't seem to make a difference:

aplay -D plughw:0,0 -f S16_LE -r 48000 -c 2 your_audio_file.wav ? this will force a more common audio format (in case the monitor supports specific audio formats. If not working, no idea, hw detection looks ok.

Sorry I mean Which kind of output device: TV, Monitor with build in speakers? I have a HDMI monitor with speakers included. Yes.

Sorry I mean Which kind of output device: TV, Monitor with build in speakers? If you try "aplay -D plughw:0,0 your_audio_file.wav", still no sound?

Here's the output, shows PCMs for both the HDMI and analog audio outputs: > How do you test the HDMI sound ? speaker-test or aplay (with a .wav file).