Dell Dimension 3100C - Manual (Page 29)

10. Reconnect the DC power cables.
11. Replace the CD/DVD drive .
12. Connect the AC power cable to the connector.
13. Replace the computer cover.
DC Power Connectors
DC Power Connector P1
Pin Number Signal name 18-AWG Wire
1 +3.3 VDC Orange
2 +3.3 VDC Orange
3 GND Black
4 +5 VDC Red
5 GND Black
6 +5 VDC Red
7 GND Black
8 PS_PWROK* Gray
9 P5AUX Purple
10 +12 VDC White
11 +12 VDC White
12 +3.3 VDC Orange
13 +3.3 VDC Orange
14 -12 VDC* Blue
15 GND Black
16 PWR_PS_ON* Green
17 GND Black
18 GND Black
19 GND Black
20 NC N/C