I have a sound card Cmedia CMI8738/C3DX PCI audio Device.Its not working. I know its old but it should work. I connected my 5.1 surround sound system to it using Stereo RCA cables. One to the green and other to the blue but nothing happens. Even tried plugging my earphones to the green one but no sound.In device manager its shows 3 devices - Realtek HD audio(Enabled), CMI8738/C3DX PCI audio Device(Enabled) and Unsupported game port(Enabled - It appeared into the device manager after plugging sound card). I can't find its software for windows 7 so installed the XP one. I even tried run it without soundcard it worked but those cables have something around them and because of that I can't plug them in properly. Please Help Me to run my 5.1