Dell Optiplex Power Supply Connector pinout and wiring @ pinoutsguide.com

Power Supply Model HP-150SS / PS-5231. The plug is an ATX 20 pin plug, but it's incompatible with ATX standards (different pinout, no 3.3V)

Pin Number	Pin Name	Description
1	+5V
2	GND
3	+5V
4	GND
5	PG	+5V when power good
6	+5V STB	Stand-by power
7	+12V
8	-12V
9	GND
10	GND
11	PWR_ON	Connect to ground to power on
12	GND
13	GND
14	GND
15	-5V
16	+5V
17	+5V
18	+5V
19	TFSC	Thermal Fan Speed Control.
20	+5V

Cable colors may differ between power supplies, even within the same revision!

TFSC - Mainboard puts 0.7 - 1.4V there to control voltage supplied to power supply's fan (fan voltage increases when TFSC increases).

Almost the same with DELL ATX power supply pinout

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connector or cable wiring scheme

Dell Optiplex Power Supply Connector pinout