Something you might try (although you didn't hear it from me) is completely
disconnecting the ground pin on your computer. You didn't mention what kind
of computer you're using, but if it's a laptop, grounding isn't too
essential. (In fact, having a permanently lifted [broken off, actually]
ground pin on mine has several times saved my laptop from almost certain
major damage when connected to equipment with a ground fault - a common
problem in my line of work.)

In my case, I'm also using a laptop for a home music recording studio (I
know, not the best choice, but it was sitting around...). All of the audio
I/O is via an external high-quality device, but ground loop hum was killing
me, *even though everything was plugged into the same outlet strip*.
Breaking off the computer's power supply ground pin completely solved the
problem.
--
Mark
"I prefer heaven for climate, hell for company."


"Dennis" wrote in message
...
I'm running the output of my computer to my stereo aamplifier.
I'm getting an annoying 60Hz hum through both speakers. This
occurs with all inputs and outputs muted. If I unplug the plug from
the back of the computer the hum stops. Help please,

Dennis