Recently I purchased a Razer Carcharias headset to game with. Every time I open up Counter Strike or League of Legends, I get this buzzing noise (like the sound of electricity) running through the headset. Whenever I talk on TS or Ventrilo the buzzing noise could be heard by other players. After adjusting all my setting I have came to the conclusion that something in my computer is not grounded properly. I noticed that this noise appears whenever it loads graphic intensive games.
Are you plugged into the front jack of your computer case, or the back directly into the motherboard? Most front jack audio connections are horrible shielded, resulting in noise bleeding into the signal. Switching to the jack directly on the motherboard should solve that.