🚀 go-pugleaf

 Al <bigal.nz@gmail.com> wrote:

>Hi Guys,
>
>I have got a mobo here that is dead. I have done all the usual stuff
>like trying new PSU, bench testing etc. Its dead - as in no fans, no
>nothing when you hit PWR button - PSU doesnt even come on.
>
>I connected the ATX molex from the PSU and shorted Green (PWR ON) with
>GND on the molex and the PC came on. All seemed fine.
>
>I think there is a IC on the motherboard between the PWR BTN headers
>from the power on switch and the ATX header on the mobo that tells PSU
>to start up.

Or the power supply,
http://www.pcguide.com/ref/power/sup/funcPowerGood-c.html

Monitor the Gray wire (+5V & +3.3V is ok).

-Also-

You short purple (not Green, Green is the wrong wire).

"Why the computer/fan does not turn on after flipping the power
supply's  switch to the ON position?
ATX power supplies differ from AT power supplies in several important
regards. Major among these is that ATX supplies depend on logic
circuits on the motherboard to turn it on. Once the power switch is
flipped, the power switch on the ATX power supply (some ATX power
supplies do not even have such a switch), the ATX power supply sends a
5V 720MA current to the motherboard through pin 9 on the power
connector. That current is for WOL (Wake-up On Lan) and power on
circuits. A power-on jumper on the motherboard connects to the
pushbutton located in front of ATX case. When the pushbutton is
pressed, it sends a signal to the motherboard, which in turn notifies
the ATX power supply to turn on full power. The location of the
power-on jumper on the motherboard is manufacture dependent. One needs
to read the motherboard manual to locate that jumper. At any event, do
not try to manually jump-start the power supply without attaching the
motherboard. The power supply is expecting certain sensing circuit
feedback to regulate the output voltage, manually starting it without
attaching it to the motherboard could cause damage to the power
supply."

http://www.bluemax.net/techtips/ATXPowerSupplyWiring/ATXPowerSupplyWiring.htm
I have always linked this page, it appears to be no more.

It was a very good site on ATX power supplies, I have the web pages of
interest if you want them.

I have a digital DC voltage display with two clips on long wires, just
made for something like this. I was given two of them, each had
instructions to wire them for different functions - I went with DC
voltage.
- very nice to have handy to monitor voltages.-
-- 

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