1. Ensure you select the source on the speaker as: “Line in”
2. Also check the following on the PC, look for the speaker icon at the bottom of the screen on the right-hand side.
3. Click on the speaker icon and ensure that "AVOCORSERIES (Intel Display Audio)" is selected.
The sound should be fine once this is selected.
4. If you cannot find "AVOCORSERIES (Intel Display Audio)" when you click on the speaker icon, please restart the computer and follow the step above.