Recently replaced the old HTPC with a new one, a Zotac Zbox. As soon as I turn on the new one, with the HDMI connected to the receiver (Onkyo 606, used with the old setup), I get a nasty hum in ...

I am experiencing the dreaded "ground hum" in my subwoofer connected to my home theater system. Unfortunately, because of placement, I am not able to do some of the typical fixes (plugging it in to ...