The audio works fine when connected to my TV via HDMI. 
The problem begins when I take the HDMI out, there is no sound.

The green levels are bouncing up and down for : Speakers - Sound Blaster Recon3Di but no output. I tried manually installing "High Definiton Audio Device" instead, but to no luck. Also tried a previous version of the Sound Blaster.

Such an amazing machine with such amazing frustrations sometimes!