Have you tried the paperclip PSU test?
*** MAKE SURE THE POWER SUPPLY IS UNPLUGGED FIRST *** Simply Jumper Pin 14 ( which is the green wire) to any of the ground pins which are 3,5,7,13,15,16,17 ( all which have a black wire). I use a paperclip to do so, just stick the paperclip into the connector like you would be pluging it into the motherboard.
In my shop we had an LED connected to two wires via this method. Not only did the fan turn on, but the light did also.
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