Do you have access to a volt meter?
If you did, you could see if you have a positive or negative pulse Motherboard.
You take the black wire of your volt meter. put it on a black pin somewhere (ground)
Then you measure the voltage of both of the power pins when the is pluged in and either on or off.
Take a paper clip. Short the two pins together with the red probe on the paper clip or just short both of them with the red probe itself. If when the pins are shorted you read 0 volts you have a standard active low power switch. If the voltage is high, then you have an inverted power switch that is active High.
You can do this test with the DSATX or with a normal house power ATX PSU.