You can learn more about the configuration of your system for sound, by typing:
/usr/sbin/alsa-info.sh
Please do NOT post the output of that script here as it is too big. If you feel obliged to share the output, then post here the URL it will provide you (or copy and paste it to a site such as New - Pastie and again provide the URL it will give).
That diagnostic script should tell you the status of all your output ports.
hi again it is a 5.1 surround sound system that i have the sound ports are onboard.
it only detects 1 output device. but when i plug them into the back ports (where they should be) it plays the audio with breaks and starnge frequency noices.