A high pitched although quiet sound seems to come from the right hand side of my keyboard ( around the number pad area), I'm not sure if its the keyboard but its something around that area. I do have really sensitive hearing so if I'm any closer than 0.5m I can hear a quiet crackling/static noise. I only noticed this yesterday as I didn't have my headset on and the room was completely quiet. Any idea's what it is? or if it's normal for some noise like this.