How do I manually turn on an ATX power supply?

[W1zzard]

To turn on an ATX power supply that isn't connected to a motherboard use a wire or paper clip to short the green wire (PS_ON) to any one of the black wires (COM).



Also, be aware that some of the older Dells (older than Dimension 4300) did use proprietary powersupplies that are not wired the same as the ATX standard, even though they will look physically the same.

I combined all the 12vdc lines and ground lines. I shorted the green wire to ground, but when I switch the power supply on, it goes into standby after a few seconds. What can I do to keep it on indefinitely?

Thanks,

-D-Rock

[Hellraiser1981]

Originally Posted by Unregistered

I combined all the 12vdc lines and ground lines. I shorted the green wire to ground, but when I switch the power supply on, it goes into standby after a few seconds. What can I do to keep it on indefinitely?

Thanks,

-D-Rock

The power supply shuts down if it doesn't receive a power good signal within about 3 secs. You need to short "Power OK", pin 8 on the diagram to a +5v line to keep the P/S operating.

[tom_johnson]

I have an OCZ modstream, by connecting the PS_ON to a gnd pin the power supply starts up fine but there is only 11volts on the 12v line. I checked to see if my multimeter was reading properly by connecting up the 20pin atx connector to a motherboard and the 12v line reads 12v as it should.

any ideas on wat could be causing this or how to fix it?

[Steevo]

Load the power supply.

[tom_johnson]

Originally Posted by Steevo

Load the power supply.

There was over 5A being drawn on the 12v rail and it stil remains 1volt down. Do i have to load up every rail?

[Steevo]

Sometimes yes, depends on the rail split though.

[rpg711]

u can also cut the ps on and solder it to the mobo ps on and it will turn on when the power button is pressed