I just finished my cnc control box and hooked it up to power with the geckos disconnected ( mostly to test fans) and I get a slight shock when I ground myself and touch the box. All the grounds lead to one common point and out through the ac power. The one common point is the back plate. So far I tested resistance from all the hot leads and got nothing saying they were leaking. So is it possible that the ground isn't going out the ac? Or is the power suply putting out extra currents or something?