My speakers make a hissing sound when i turn up the volume and that noise is persistent even when there is nothing playing. I checked all connections, and even did a full blown windows reformat (media PC so nothing really on it anyway) the problem is there with the windows built in drivers, as well as the realtek drivers, an the hissing goes away as soon as i unplug the speakers, which means speakers are fine. i tried earphones, and the problem is still there. ANd one more thing is that the hissing noise starts right past the windows boot logo. any suggestions guys?