This just started today, but when I connect the magnetic head of the power adapter to the input on the computer it starts to make this..short buzz/tick/click noise and I don't know why. I know it's not the port or the speakers or the computer because when I unplug it the noise stops. It's really quiet and it's mostly just annoying. I just bought the cord new not more then a year ago, so I don't know why it would be making that noise. If anyone could help that'd be nice. Thanks!