I spoke with Klaus, and he too suggested using a cheater plug. I just bought one during my lunch break, rushed home and made the switch. No more buzz.
But...(there's always a butt, isn't there?)
My right channel is dead. I called Klaus back and he says I blew a fuse. He's going to talk me through replacing the fuse, and he's sure I'll be up and running in no time. I'll keep you posted. So far so good. (Now if that's not thinking the glass is half full, I don't know what is!)
Oh...here's some pics.