Sonos beam gen 2 as PC Speaker (windows)

Are you sure the computer is outputting a signal on the HDMI connector? 

I double checked HDMI in box with Sonos beam gen 2 with my PC monitor all ok, but with audio not working with setup that.  

From what I can tell, your board has an SPDIF output on the back, you can use optical cable with adapter included with Beam 2 instead of HDMI 

Yes, I used this solution. Check in Sounds, I see have signal sound dancing, but no heard any sound, all config is default but no sound. Do you have any comment for config this? Thanks.

Is there something you need to configure in settings, to send the audio to that port? 

The only thing I can say is:

• Make sure that Beam is using input as a source (Sometimes Airplaying, Spotify Connect can change a source. By replugging the connectors or switch to TV source in the app sound should be back)
• In Windows Make sure to use correct sound output (sometimes disabling other outputs is needed to get correct result)
• Make sure that both Windows and Beam have volume up (try increasing in manually on beam) 
  
  I’m no expert but those are the only tips that I can provide to help. 

Yes, I don’t know what setup needs to be set in Control Panel/Sound/...S/PDIF for beam gen 2 using optical out.

Most PC's do not do HDMI-ARC, but the Beam needs it. That's probably why you did not get sound from HDMI. Why optical does not work for you remains a mystery.

Yesterday, I tested again and have some results: 

• PC → Sonos HDMI → Monitor → OK => Sonos HDMI ok
• PC → Sonos HDMI + Sonos HDMI to optical → Beam gen 2 → no sound
• TV → Sonos HDMI + Sonos HDMI to optical → Beam gen 2 → no sound => I think Sonos HDMI to optical has a problem