From last few days i have noticed that my computer speakers emit high pitched sound when i switch on my comp, and even when i switch on other electric appliances like fan, light they emit noise. This happens when the speakers are on, even if the comp is not switched on. And there is no problem after I get the Windows start-up on the comp. They perform normally after I login. So is it a problem with Computer speakers or any other, how can I get rid of this problem?
