Motherboard and sound system help

Whovian98

Honorable
May 6, 2013
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10,640
Hello all! I am currently attempting to set up a Creative speaker system to my new build, but I am currently having some issues. I have everything plugged in, but no sound comes out of the speakers! Heres my motherboard:
http://www.newegg.com/Product/Product.aspx?Item=N82E16813157281
And I am currently running Windows 7 64-bit. I don't know what the set of speakers is though, because I got them as hand-me-downs from a friend. Now, there are 3 identical speakers that all plug into the sub. Then from the sub, there are three wires that go to the back of my computer. There is a green, black, and yellow cord. When I color code it up to the back of my computer (except for the green, that one went to a grayish one labeled side), I can't get any sound from any of them. I hooked up each wire separately to just a plain out, and all of the speakers work. So is there any way I can get them all functioning at once..? Please help!