sorry but that just isn't right. quite an ingenious way to operate an electrical switch isn't it, without electricity? there is a current, just one that presumably should not harm you.
For some of you that do a lot of bench work,, i recommend buying a meanwell 300w power supply. Perfect for bench testing parts,,, and powering up fans.
It isnt a pc power supply, it is a bench model that has screws for you to connect wires to it