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ATX PSU Power diagnostic purple

Check the purple wire first (a.k.a. "so that's how my computer died")

So the power on my CNC machine was going to come from a computer power supply, and I had a recently decommisioned computer lying around.  Instructables and other sites have some good instructions on "ATX power supply to DC"  and "ATX power supply to lab power supply" (search strings).  After wiring the thin orange to the thick orange, and the thick green to black, and a red wire to a "sandbar" load resistor, I thought it should be working.  After all the changes, I still did not even have 5V coming out of my purple "standby power" wire.