USB plug & case sparks

Mon, 16 Aug 2010 19:58:46 -0700

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? 

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