Humming sound coming from speakers

[USCRobertWoods]

Hello,
I can't seem to figure out where the humming sound is coming from. I have audio from the MoBo connected to a stereo receiver then out to bose bookshelf speakers.

 

[americanaudiophile]

If the noise only happens when you connect the mobo to the receiver then you need to either use an in line noise decoupler. Car stereo guys use ones that are not too expensive. This is actually a transformer that allows the signal to pass without a ground connection between the mobo and the receiver.
You can also try using a 3 to 2 ground lift ac adaptor on the PC and / or the receiver.
If the noise is happens even when the mobo is not connected them disconnect each additional source that is connected to the receiver. Cable boxes often cause noises even when not selected due to bad grounding practices.