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ATX power supply

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by Member 29714308

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With a pentium II and an ATX power supply on occasion I do not get any power. Sometimes I need to only unplug the power cord from the power supply itself or change the cord and it will power on. Other times I need to unplug the power supply from themotherboard and plug it back in again. Then it will power up fine. Sometimes it will run for weeks, other times only days before I need to again unplug and replug. Why does this happen? Can it be prevented? Is it the power supply or the motherboard?

9 replies

by paslebcomputer

I say that you have a loose connection in the power supply somewhere and it needs changing.. compare $25-75 for a new one or $500-1000 for new PC. if you have another PC or a Good friend that will let you test it on thiers. you can plug the power supply to it and see if it does the same. or buy a ATX tester and see from there.

by thechas

I have seen this from time to time on several systems with ATX power supplies.

I suspect in your instance, that Windows is not shutting down properly, and the power button isn't functioning properly.

I recommend checking the power management settings in CMOS setup.
Make sure that power management is enabled, and set to user defined.

I would also double check the power switch and it's connection to the motherboard.

Chas

by fury57

You do not mention what OS your system has, IF XP and Gigabyte motherboard try different Power options within Windows, also check for BIOS update from your computer/motherboard manufacturer and try different power options from CMOS as well, IF Win98do the same as XP, and also but not less important make sure that you are cooling very well your sytem-DO NOT-use only the power supply fan to exaust the heat from inside your case you have to have in-take and out-take-I have and AMD Processor that runs at 1.9Ghz and I have 2 intake and 1 out-take plus the power fan that is used as out-take as well, good luck.

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