You need to make sure the video cable is fine. If possible test different video cable and also try getting head phones to test the audio controller. It might be the video cable.
Thank you for the suggestion.
I got another cable and same result, still no sound going through to the monitor. The OS recognizes the monitor as a playback devices and for Windows it seems that everything is working properly.
Any other idea?
Actually found out that the problem was with the connection to the speakers. I assumed this was fine, but the cable was faulty. Assumptions, assumptions, assumptions...
Alright, that's great. I am glad your system is working now.