63.5W voltage pinouts?

[dongfeng]

I have a an original 63.5W PSU from an IBM 5150 that appears to powers up fine, but doesn't actually power on the motherboard. I've checked and the motherboard does work with a known good PSU. Does anyone have the voltage pinouts to hand so I can check them?

[modem7]

http://pinouts.ru/Power/MotherboardPower_pinout.shtml

except that pin 2 on P8 is not in use by the IBM 63W PSU (or the 5150 motherboard). Pin 2 use was introduced in the move to the 5170.

Check the 'power good' line as well - it is what takes the motherboard out of the reset state on power up.