so i just got a new dell inspiron 530s and i have a logitech 5.1 speaker system and only 2 speakers and 1 sub work. It's Windows vista and i've set the realtek hd audio to 5.1 surround and the settings in the control panel to 5.1 but it still doesnt work. i have my old xp and all i have to do is set it to 5.1 and all the speakers work. can anybody tell me how i can fix this? thanks a lot