"While the USB cable connected to the computer was loose, it curled around I 
accidently kicked it and it slid under the power supply and contacted one of 
nuts on the bottom of the power supply and sparked."

The most likely contact scenario would seem to be that the shell of the USB 
connector made contact with a grounded nut on the power supply.   What is the 
voltage of the PSU chassis relative to the PC chassis (or USB shell if using a 
laptop with no exposed chassis)?

Andy, k3wyc
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