Theres definitely a problem with the mediator.
Take a look "carefully" to the 6 pins molex female socket soldered to the mobo (with a magnifier lens).
Mine for example, has the 5 volt female pin, a little bit faked(?) and btw i have to replace it.
Consider that those kind of connector has a avg. lifespan of 50 insertion !?! . . . go figure!