Dell Dimension 3100/E310 - Manual (Page 51)

DC Power Connector P2
DC Power Connect P3 and P5
DC Power Connector P7
DC Power Connectors P8 and P9
23 +5 VDC Red 18-AWG
24 COM Black 18-AWG
Pin Number Signal Name 18-AWG Wire
1 COM Black
2 COM Black
3 +12 VA DC Yellow
4 +12 VA DC Yellow
Pin Number Signal Name 18-AWG Wire
1 +3.3 VDC Orange
2 COM Black
3 +5 VDC Red
4 COM Black
5 +12 VB DC Yellow
Pin Number Signal Name 18-AWG Wire
1 +5 VDC Red
2 COM Black
3 COM Black
4 +12 V DC Yellow
Pin Number Signal Name 18-AWG Wire