Smiff 24

This is an atx with a on/off toggle switch,
It has a green (ps on) and a grey (power good) wire,
I connect the green to a red wire (+5v.) ...wont turn on.
I connect the grey to a red wire...wont turn on.
when I connect the green to grey it runs but the +12 v. will jump between 12.1 then down to 11.5
real sparattic. Is this pc supply shot or is there something ive overlooked ?
Ive done 3 others and havent run into this before.
Any help is appreciated.

exeter_acres

My Feedback: (2)

iirc, I connected the green to a ground (black)..

a PSU needs a load to stabilize the voltage...
did you install a resistor to apply a load?

Smiff 24

Hey exeter,
Yes, I used a resistor and that got it up to 12V.
I connected the green to red and it wouldnt come on.

Andrew

The green Power_On line is an active high rail - if you meter this while the PSU is plugged in and the AC master switch is on, it will generally run between 4 and 5v DC. To power up your PSU, this line needs to be pulled low, ie. shorted to DC ground. You may either manage this via a toggle switch, or if your PSU has a master AC switch on the back, just tie the green wire to one of the DC grounds (black) and use the AC switch.

Smiff 24

Thanks all, got it rite now, everything wired and putting out a steady 12.2 V.