Your problem is you have a 3 channel sound card on your dell and you bought 5 channel speaker system. You can plug the green to green and get 2.1 sound but you will have to by a 5.1 pci sound like in the link below to get the full use of your 5.1 system.
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Your problem is you have a 3 channel sound card on your dell and you bought 5 channel speaker system. You can plug the green to green and get 2.1 sound but you will have to by a 5.1 pci sound like in the link below to get the full use of your 5.1 system.
http://www.mikescomputershop.com/asus-xonar-d2pm-sound-card-p-2357.html