Does your computer have a sound card or is it built into the motherboard? If it has a video card check the drivers then if nothing try removing, cleaning the contacts and reseating the sound cards. I have seen that work before.
There's several things that might play a roll in it. After you try reinstalling the drivers let know what happens. I'll do alittle research and see what I can find. Does your stereo require alot of power from the card to push the speakers or does it have an amp to boost your watts?
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