^Secondary Audio Programming (may be
listed under a different title in computerese).
Let us know what happens.
What kind of cable are you using to connect your computer to the stereo system?
^^This
Also what volume is your stereo at? If you're using an analogue cable/source and have your stereo volume high (understandable so you can control the volume on your PC) you will get a hum.
Only fix is to either turn down the stereo volume or to use a digital cable such as optical or digital coax.
Mostly right, If its a digital connection, then the sound will be clear, no matter what volume you have set.
But if its an analog, and you use the computer to control the volume, you will probably get a slight hiss in the sound
In the upper right-hand corner, it says "Device advance settings" and this draws interest. Why? Because it so happens that SAP is an advanced feature for tv sets (to let you know, it always worked to have customers turn off the SAP setting to get rid of the humming problem from their tv sets).
I would open up the device advance settings to see what setting your stereo is on right now and make a note of it. Then I would try out the other settings to see if the humming disappears. If so, then your problem is solved or you can go back to the original setting your stereo is on if the idea doesn't work (in fact I'm curious to see what the setting choices are for that advanced category).
If it doesn't work, then you can try out the other suggestions that have been offered as I'm trying to keep you from going through additional expense and effort or by losing the full use of your stereo by lowering your volume.