Unwanted Digital Sound Coming Out Of Motherboard

Unwanted Digital sound from the motherboard is coming out of the speakers.
I hooked up speakers to my "little Laptop", and was disappointed to find this sound coming out of the speakers. Can't have that.
I had tested it much earlier with ear phones, and did not notice it. But now I know why I did not notice it with the ear phones.
I have now realized that it is only coming out of the right speaker, not the left. I have bad hearing in my right ear, so that's why I did not
notice it with the ear phones.
I fixed the problem by installing an isolated power supply. It takes the 12 volts in, and gives out isolated 12 volts to the speakers.

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