I have a Logitech Surround Sound Z506 system and am trying to connect to my HP Pavilion 23 PC. I have connected the green, orange and black cables to the subwoofer but am having trouble with the computer connection. The only holes are a green one and two no colour ones with a headphone symbol over them. There are no other holes. I assume the black and orange connect into these ones? Is this correct? I have also tried to configure through the control panel; however I cannot select the surround sound speaker box. Is there a way to do this or can the settings be altered a different way to allow speaker connection?