Dell Dimension 3100C - Manual (Page 45)

DC Power Connector P4
DC Power Connector P5
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Pin Number Signal name 18-AWG Wire
1 +12 VDC Yellow
2 GND Black
3 GND Black
4 +5 VDC Red
Pin Number Signal Name 22-AWG Wire
1 +5 VCD Red
2 GND Black
3 GND Black
4 +12 VDC Yellow
Pin Number Signal name 18-AWG Wire
1 +3.3 VDC Orange
2 COM Black
3 +5 VDC Red
4 GND Black
5 +12 VDC Yellow