I can't get any sound to come out of my comp. Not even the introduction music you get when the comp first comes on. I've checked all the ports and the device manager says that everything is working properly -- yet I still hear nothing! All of my media devices seem to be functioning fine as their bar still moves as they play, however, nothing is coming out of my speakers. And yes, I have checked to see if they are turned on or plugged in. Any help would be appreciated.