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The computer output is probably unbalanced, connected to the computer's ground, which has a lot of spiky noisy currents going through it (hard drive heads seeking, display refreshes, memory access bursts, etc). You want the negative input of the power amp completely isolated from the power amp ground.
If the class D amp doesn't provide a differential input, you can make one with an op-amp in the differential amplifier configuration. Rg will be connected to the ground of the power amp, V1 to the ground of the computer, V2 to the signal from the computer, and Vout to the input of the power amp. You should add an identical capacitor in parallel with Rg to keep the common-mode rejection good at all frequencies. This is the spot on issue, when the signal comes over if you are not referencing the ground of the signal when amplifying you are going to have a ground loop that goes to the wall outlet and back to your device.

Good grounding is not a trivial subject, and there is often not a simple easy answer, especially after the fact.
It would be difficult to describe exactly what to do, even with good diagrams of your setup. Sorry to not be more specific, but this is actually a rather complicated problem many more details of the setup would have to be known to offer any better suggestions.
I gave you one answer, but I see you edited your post to basically ask the same thing again.
Use separate power supplies for the computer and amp, then tie the grounds together only thru the single audio cable. If you really need to run the computer from the 12V DC power, then get a isolated DC-DC converter. That's why professional audio equipment uses balanced signals instead of single ended signals like your PC makes. An Audio isolating transformer is the first port of call, even a cheap device will probably make a noticeable difference, given that you have so much noise.
Not the answer you're looking for?Browse other questions tagged power-supply audio noise groundloops or ask your own question.
Is it normal for a PhD candidate to be dissatisfied with their PhD thesis topic, if the field is not hot? Does the union of two not disjoint open balls always contain the line connecting the two centers? You must have JavaScript enabled in your browser to utilize the functionality of this website. This unit operates anywhere in the world automatically with a wide AC input voltage range from 100V to 240V.

There is now no need to worry about making sure the right AC input is selected or risk damaging the unit. If I connect a pair of headphones (D, only one channel shown) in parallel with the amp inputs, I hear switching noise on the headphones; if I disconnect the amp on one channel, then in the headphones (still connected to the computer) the switching noise goes away on that channel.
The reference of the other ground and using a differential amplifier is a pretty great idea.
I would have used dual inverting stages if I cared to stop inversion, but inversion should not matter in an audio signal, right? Your drawing is more or less exactly what I'm doing now, except that the amp does not have differential inputs, just plain unbalanced audio line-in.
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I would not that driving your signal into the non-inverting side of an op-amp is not my favorite as it saturates easily and has large leakages, but it will get the job done. This is for a sound art project so it's important that the noise be reduced as much as possible. The power amp probably has a differential input (please specify what you're using for the power amp), which you can use to cancel that noise out.

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