The right hand speaker of my Logitech X-230 set is not working. This is the speaker with the volume control and headphone port. The left speaker and subwoofer work perfectly fine. The volume control and headphone port also work fine; There is simply no sound coming out of the right speaker, even if I turn the volume up very high. It has worked before now, this just started recently.

Does anyone know how/if I can fix this?