No Audio from speakers

I really need some help

I have a Dimension 5150 Dell Computer with Integrated 7.1 Audio.
I can play CDs ok but I don`t get any other sound from the speakers.
Can anyone suggest anything. I`m only a novice.
 
Thanks rik - I managed to fix my sound problem by reinstalling from the CD that came with the computer. Everything is fine now.
 
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