I believe this is right, not sure though, I found it on a xbox modding forum
Pin_________Desc._________Wire Color
1___________+12V____________Yellow
2___________+5V_____________Red
3___________+5V_____________Red
4___________+5V_____________Red
5___________+3.3V___________Orange
6_________+3.3V STBY________Brown
7___________GND____________Black
8___________GND____________Black
9___________GND____________Black
10__________GND____________Black
11_________Power on_________White
12_________Power OK_________Blue
xbox mobo pwr pinout
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