Every ATX power supply I have seen and taken apart....has a common ground.  Take off the case and you find the 6 or 8 ground wires are all tied back to the PS ground plane.

Dave Lag <davescomputer@rogers.com> wrote:John Pearson wrote:
> I want to convert my Dell ATX power supply to the standard power plug pinout. So I need to add the 3.3 volt lines to the main plug. I noticed that the 3.3volt lines have their own ground.
> 
> Does anyone know what pin on the standard ATX power plug is the ground for the 3.3 volt lines?
> 
> Thanks
> 
> John

I suspect the grounds are all common- meter the dell PSU to see if they are?

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