sun-fire-v890-psu-pinout

OFF					B1		Pins	x1	x2	x3	x4	x5	x6		A1
							y1	0	GND	0	4.8	0	6.05
	0	0	0	0	GND		y2	4.93	0	GND	0	0.03	0		GND	GND	0
							y3	GND	0	4.84	GND	5.11	5.11
							y4	0	0	0.06	0.7	GND	0

To start the Power Supply shorten Pins x4y1 to GND and x3y3 to GND.

ON					B1		Pins	x1	x2	x3	x4	x5	x6		A1
							y1	0	GND	0	0	0	6.05
	12.1	5.1	3.4	3.4	GND		y2	4.93	0	GND	0	0.03	0		GND	GND	48.1
							y3	GND	3.37	0	GND	5.11	5.11
							y4	0	0.15	0.06	0.7	GND	5.14