power supply won't shut off

November 2, 2010 at 16:35:03
Specs: Windows XP Prof SP3, Pentium 4/4GB
ATX tower, PERL D865 board. Was using computer today, everything fine. Shut it down, fine. Hour later pushed tower power button, it powered up but wouldn't bootup. Nothing on screen, blue standby/no signal light flashed at monitor base. Kept waiting, no system info appeared on screen, nothing. Pushed power button on tower, no response. Several minutes later resorted to powering off by using the master power toggle on PS. Turned toggle back on, computer powered up (without pushing power button) but same symptoms - nothing on screen, no bootup, master PS switch only way to cut power.
Any ideas??

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November 2, 2010 at 18:35:01
Disconnect the power cable.
Reseat all the PCI cards inside the computer.
Connect power cable and turn it on.
Report back on what happens.

The original poster should always write the last response !!!
Let us know, if the problem is solved !!!

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November 2, 2010 at 18:43:26
The power supply should shut off if you push down and hold the on/off switch for at least 4 seconds.

Could someone have messed with it? It the power supply has a 115/230 switch on the back make sure it's in the correct position. DON'T GUESS and don't switch it while it's plugged in.

You can try removing all the cards except video and disconnect all the drives. (Make notes about reinstalling them, if necessary.) Then start it up again. If you get a posting screen then one of the removed items is at fault.

But likely it's either the motherboard, power supply or both.

A power supply can turn on but still be bad. It needs to supply several different voltages at sufficient amperage. So while it may provide the 12 volts for the fans that doesn't mean it's supplying the other power requirements.

And if a power supply goes bad it can often ruin the motherboard as well.

It it's not one of the attached peripherals you can try swapping the power supply with a compatible known-working one. If it still doesn't give a posting screen it's almost certainly the motherboard.

DAVE says, "Don't be an idiot. Vote Republican"

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November 2, 2010 at 19:21:00
DAVEINCAPS: Thanks for the 4 sec hold on the power button tip, it worked. However, on restart I still have same symptoms - no startup screen, etc and no monitor function.
PAULSEP: After some success with the 4 sec advice above, I'll dig into following thru with your suggestions tomorrow after a good night's sleep. Will post again tomorrow PM with the results. Thanks to you both.

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