You could also try shorting the green wire on the ATX connector of the psu with any of the grounds (black wire) - that should turn on the PSU (disconnect everything from the mobo)
on the pic we can clearly see only 1 6pin on the other hand fudzilla has this news -> http://www.fudzilla.com/index.php?option=com_content&task=view&id=7781&Itemid=65