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PSU going bad? PC difficult to power on after outages

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#1 Tim Brastow

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Posted 31 July 2014 - 07:34 PM

We have a rather old computer in our office that my parents use. Every time there is a power outage in the house, the computer is a little difficult to power back on. When pressing the power button, the PC will remain on for 3 or 4 seconds, power off, and then you'll hear one last "breath" from the PC before powering off for good.


I have generally resolved this by unplugged the power cord from the PC, reconnecting the power cable from the PSU to the motherboard, holding down the power switch (with no power cord attached) to drain any voltage within the computer (is that true?). Usually it powers on afterwards.


But sometimes, and this has happened several times, when reconnecting, the PC will immediately power off after re-connecting the Ethernet cable, which I find really strange.


This is a 650V PSU. Is the thing just going bad? Is it somehow not getting enough power to prop up everything within the PC? Or does it sound like something worse?

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#2 ElfBane


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Posted 01 August 2014 - 03:36 AM

I would replace the PSU and also start using a UPS. A UPS will prevent those power surges/outages from damaging the PC.

#3 zingo156


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Posted 01 August 2014 - 09:28 AM

This does sound like a power supply issue to me. If you intend to replace the psu yourself, first open the computer case and dust out the computer and inspect for blown or bulging capacitors on the motherboard examples: https://www.google.com/search?q=blown+bulging+capacitors+motherboard&source=lnms&tbm=isch&sa=X&ei=laPbU-PvMoazyATp5YG4Dw&ved=0CAYQ_AUoAQ&biw=1440&bih=766


If you have any bad capacitors, I would recommend putting the money toward a newer machine. Bad caps don't always cause problems but eventually they will.

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