power supply question


M

Matt

I went to boot up my system today and when I pressed the power switch all
the fans in the system started up for a couple of seconds then stopped and
nothing else happened. So I switched from the battery backup to the wall
outlet and tried again and then the fans wouldn't even spin (and when I
switched back to the battery back they are also still dead)... so I'm
assuming a dead power supply, but I still have a green light on my
motherboard... does this sound like a dead power supply to everyone else?
 
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D

Dave

Matt said:
I went to boot up my system today and when I pressed the power switch all
the fans in the system started up for a couple of seconds then stopped and
nothing else happened. So I switched from the battery backup to the wall
outlet and tried again and then the fans wouldn't even spin (and when I
switched back to the battery back they are also still dead)... so I'm
assuming a dead power supply, but I still have a green light on my
motherboard... does this sound like a dead power supply to everyone else?

Yes, especially if the fan in the power supply is not spinning. -Dave
 
F

Franc Zabkar

Your start switch could be stuck on. That's what happens if you hold the
switch in. Try another switch.

If you think that the start switch may be faulty, then disconnect it
and short the relevant header pins with a screwdriver.

- Franc Zabkar
 
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F

Franc Zabkar

I went to boot up my system today and when I pressed the power switch all
the fans in the system started up for a couple of seconds then stopped and
nothing else happened. So I switched from the battery backup to the wall
outlet and tried again and then the fans wouldn't even spin (and when I
switched back to the battery back they are also still dead)... so I'm
assuming a dead power supply, but I still have a green light on my
motherboard... does this sound like a dead power supply to everyone else?

You could have an external short circuit on one of the PSU's supply
rails. I'd disconnect everything that isn't needed, including RAM and
graphics card, and try to start the PSU with this minimum
configuration. Otherwise you could disconnect absolutely everything,
hook up an expendable load such as an old HD, and then start the PSU
by shorting the PS_ON pin to ground.

See http://pinouts.ru/Power/atxpower_pinout.shtml

It looks like the motherboard is trying to turn on the PSU, but just
to make sure, I'd monitor the PS_ON pin with a multimeter while you
operate the front panel power button. PS_ON should switch from +5V to
0V. Also check the +5VSB rail.

- Franc Zabkar
 

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