On 2016-02-15 Wyatt Zacharias wrote:
I've never used the 5v rail on its own, but I've used the 12v rail for various things. They do make great high amperage supplies. You have to short the green wire in the main 24 pin connector with one of the many black ground wires and then it'll turn on.
Haha, Wyatt's showing his age! He's never even seen an AT PS! Probably wasn't born yet :-)