FOR YOUR CONSIDERATION IS THIS USED AND WORKING - ANTEC  SU-380 380W POWER SUPPLY 12V PSU ATX, W/FAN    WORKING 

THERE IS A SWITCH FOR THE FAN , THIS MAY HAVE CAME THIS WAY , I'M NOT SURE. IT CERTAINLY LOOKS LIKE THE MFG DID IT .

PULLED FROM A PC WITH A DAMAGED CASE 

20/4 PIN