Hi! Sorry to hear that you have troubles with this, please try the next steps:
- Right-click the speaker icon in your taskbar > Sound settings.
- Under Output, look for your HDMI device, it might show as your monitor or TV name, or “Digital Audio (HDMI)”.
- Select it, then test the sound.
- If it’s not listed, right-click in the Sound control panel’s Playback tab > enable Show Disabled Devices, then enable it.
If this doesn't work, please unplug HDMI from the PC, plug it back in, wait a few seconds for Windows to detect it, select it again in Output devices. You can also try a different cable and connect the PC to a different screen to discard hardware issues.