the green one and any black one on that connector ,
i was doing that today cos i was installing all my goods in a new case and i installed a standoff wrong and it was shorting ma mobo but i though my PSU was dead so what a better way to check
I have a project in mind involving a set of cold cathodes , i am gonna mount them on my monitor , i can get cheap sets at £2.99 a set and an old 145w psu happy days , might even do some led fans like you