Personally, I would avoid any 'direct' wiring between the power supplies....and try a relay to trigger the second PS.
check your motherboard with a volt meter to ensure you have the proper pins that are triggered when the "power button" is pressed.
plz unplug the PC first......
20 PIN (For ATX motherboard Main Power Connector.)
Connector: Molex 39-01-2200 or approved equivalent.
18AWG Wire Signal Pin Pin Signal 18AWG Wire
Orange +3.3VDC 11 1 +3.3VDC Orange
BRN. +3.3V 11
Blue -12VDC 12 2 +3.3VDC Orange
Black COM 13 3 COM Black
Green PS-ON 14 4 +5VDC Red
Black COM 15 5 COM Black
Black COM 16 6 +5VDC Red
Black COM 17 7 COM Black
White -5VDC 18 8 PG Gray
Red +5VDC 19 9 +5VSB Purple
Red +5VDC 20 10 +12VDC Yellow
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