I had a similar problem.
The player defaulted to the not working speakers on my monitor.
I fixed it by right clicking the volume icon in the tray and choosing Sounds.
There I chose the Playback tab and deactivated the monitor speakers.
Then it used my normal speakers.
Click on the desktop and open the NVIDIA control panel, select the digital audio portion, and turn off HDMI audio then click on the Windows sound button. Test to make sure the speakers do indeed play the tones. You should be able to select the sound card. Worked for me after initial failure with HDMI monitor without speakers.
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