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  #1  
Old 04-08-06, 21:06
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Default ATX Power Supply don't shut off

When pressing the button on the case or clicking Start/Turnoff computer, windows goes through it’s normal shutdown, the hard drives stop, monitor goes to standby, but the power supply don’t shut off. Power light around the case button stays on, fans all run and all the supply voltages are still present. It will reboot like normal and works fine when the button on the case is pressed. I used it this way for about a week, then unplugged it for the night. When plugged back in, the fans started the hard drives came on and the hard drive light stayed on steady, no flashing, power light around the button did not come on and the computer did not boot, monitor still in standby. If I unplug and plug the power cord back in quickly a few times the power light comes on and it will boot normally and works fine again.
When checking the voltages the –12v fluctuated rapidly from –8.9 to –12.6 so I replaced it with an Antec Smartpower 2.0. The –12v is rock steady now but when shutdown the power supply still don’t shut off.
The Antec power supply has a power switch, but if I use it, the same thing happens when it’s turned back on, and I have to switch it on and off quickly several time to get the computer to boot up again. I’ve made sure hibernation is disabled in bios, and the battery is new.

eMachine W2686
ADM Athlon XP2600
2.12GHz
512MB Ram
Window XP Home 5.1.2600 Service Pack 1 Build 2600
80GB Hard Drive ST380011A
80GB Hard drive WDC WD800EB-00DJF0
Lite-On DVDRW SHOW-1613S
NVIDIA GeForce FX5500

Thanks for any help
Mike
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  #2  
Old 04-08-06, 21:09
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Default Re: ATX Power Supply don't shut off

Go to the control panel/power options/advanced/power buttons.

See if you can change it in there.
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Old 04-08-06, 21:27
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Default Re: ATX Power Supply don't shut off

control panel/power options/advanced/power buttons - set to shut down,
hibernation is disabled.

Windows shuts down like normal when the button is pressed, the power supply just stays active all the time.

Thanks for the quick reply!
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Old 04-10-06, 06:55
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Default Re: ATX Power Supply don't shut off

Can anyone tell me how the mother board signals the power supply to shut off? What pin on the connector, voltage or wave form when on and off? Any other possible solutions?
Thanks in advance!
Mike
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Old 04-14-06, 08:54
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Default Re: ATX Power Supply don't shut off

Ok, I have done more research, pin 14 should go to 3-5v to shut down the power supply. It stays at .02v all the time, even when everything should be off. Anyone have any idea why it's not getting the logic high to shutdown?
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