Have you tried unplugging your CATV cable? That seems to be the only
thing you didn't try.

Chris.

Len,
>
> I tried all you suggested, except checking the earthing, I'm not sure
> how to do that.  It does seem to be in the building wiring.  (I wonder
> what changed, it worked before.)  Anyways, the hum comes through with
> the computer turned off.  If I unplug the computer, the hum is still
> there, being transmitted over the parallel port cable from the printer.
> (This shocked me, I'm figuring it's a pretty large problem.)  The
> computer is plugged into an UPS, everything uses grounded plugs.
>
> I'm lost on the grounding issue, anyone have any ideas on how I can fix
> the ground or at least get the circuit my computer's on grounded
> properly?  Also, is this dangerous to my equipment?  It seems to be
> throughout the building, as I tried running a grounded extension cord
> from outlets in other rooms (on different circuits I assume) and the hum
> never went away.
>
> Kevin

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