I recently just got a sound card. Specifically the Lantec 7.1 Channel PCI Sound Card. And I'm running tv output into it, it comes out into my Razer Carcharias Headset. With nothing playing there's a buzzing noise that is pretty noticeable. The volume of the buzzing changes when I increase volume on my computer and headset, but I've turned my tv off, and and checked the mixer on my computer (that's running Windows 8) and it has nothing playing . I have no clue what to do, it may be cables, but I doubt it, since I've had no problem with the cables before!