erm on my hiper i repaired (just the fan, not the power circuit), 14=blue, 15=black and 16=green, which from the manual is: -12V, COM (0V /GND i'm thinking), and PS_ON#. Its 24-pin too.
which would mean in this case, you short 15 & 16?
i managed to get it to get in standby mode, but couldn't get it to power on. the fans just "blipped" and nothing else, there is another connection called PWR_ON, but i never got round to testing as i was only on my lunch break!
i can't remember which pins i shorted( most likely PS_ON# and COM, but don't quote me) but i made sure, by reading the pin outs in the manual, and checking what voltage was on the pins with a multimeter , that i wasn't shorting a supply rail.
Well I DID some experimenting today. I took my old PSU and converted it to a "lab" power supply. +5 -5 +12 -12 +3.3 and GND are now accessible via plugs. This gives a wide range of possible voltages. To turn it on I connected GND and the Green power_on wire to a switch. As power_OK indicator I use a LED connected to the grey Power_OK line (5V high), 220 resistor to GND. What I found out however is that most PSU's need a load to stay powered on. Usually a load on the 5V rail will be enough. For that purpose I use a 10 Ohm 17W resistor between 5V and GND. You should use (little bit of calculation) at least a 10W resistor. I mounted the resistor (which is pretty big) to the metal casing in front of the fan. IT doesn't get too hot like that. For a little gadget you could use the purple "standby" chord to indicate that you're turned off...
HOWEVER: that is pretty dangerous tinkering. Before you open a PSU you should be aware that the capacities inside will most probably still be charged and they can provide a strong and dangerous shock. Furthermore I would suggest to use fuses at least on the GND. 1A at most. But it would be better to use fuses on all connections. A short without any fuse between random rails would be pretty "hot". Especially with high power PSU's.
You see; our discussion yesterday has inspired me quite a bit