This is from out of phase ac connection, you would be wise to get a plug
checker at the electrical store, they cost about $ 5. with lights to tell you
the wiring error, but you still can cause this even after the check passes the
wiring by using non-polarized plugs.
This is a quick fix.
Also, in the primary of the Mac power supply is a resistor and a capacitor that
need to reduce RFI but that can be only parlty connected, try a different Mac
to see if it sparks.
JML.
>On Aug 16, 2010, at 7:58 PM, Kris Tilford wrote:
>
>> I've got a G5 PowerMac which has the full metal case. Last night I was
>> plugging and unplugging a powered USB hub in the dark, and I noticed that
>> simply touching the metal of the USB plug to the metal of the case caused a
>> small visible spark between the plug and the case. This seems wrong to me,
>> and I'm a little worried. The spark was very tiny, but it was consistent,
>> and wasn't enough to do anything abnormal like pop a fuse or ruin anything.
>> The hub works fine still, but somehow this seems wrong. Has anyone else seen
>> sparks between USB plugs and their cases?
>>
>>
>I've seen it on one of the Cubes and it's unsettling so I'm very careful about
>plugging in live now. I did ruin a TiBook with a power adapter 6mos ago.
>
>John Carmonne
>Yorba Linda USA
>Sent from my MBP
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