Dell OptiPlex GX60 - Manual (Page 73)

DC Power Connectors P2, P3, and P4
DC Power Connector P5
Small Mini-tower Power Supply DC Connector Pin Assignments
Pin
Number Signal Name 18-AWG Wire
1 COM Black
2 COM Black
3 +12 VDC Yellow
4 +12 VDC Yellow
Pin
Number Signal Name 18-AWG Wire
1 +12 VDC Yellow
2 COM Black
3 COM Black
4 +5 VDC Red
Pin
Number Signal Name 22-AWG Wire
1 +5 VDC Red
2 COM Black
3 COM Black
4 +12 VDC Yellow