I just put together a new system using a MSI motherboard NF750-G55. I loaded Win7 Pro 64bit and assorted drivers. The trouble I don't get any sound when I plug in speakers from the rear, but I do get sound when I plug them in from the front. I do get the pop up window telling me I've plug the speakers in from both the front and rear plug but only sound from the front. I've tried every possible combination with the Bios and the front speaker connection. Even unplugged the front speaker connection on the motherboard and jumped pins 5&6 and 9&10 . I'm slowly coming to the conclusion that the problem is the motherboard itself. Does anyone have an idea? I'm open to all suggestions.