No sound? Check these points

1. 1Raise the device and browser media volume, then try the left and right buttons again.
2. 2Confirm the headset is the active audio output in your operating system.
3. 3For Bluetooth headsets, disconnect and reconnect Bluetooth and check that media audio is enabled.
4. 4If only one side works, check balance settings and disable mono audio temporarily.
5. 5Try another browser tab or a short music track: if that is also silent, the issue is outside this test.