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I can't figure out why my power supply doesn't work

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  • Components
Last response: in Components
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August 29, 2014 4:44:05 PM

I've been having computer trouble and I've found that it is my power supply. I used the psu from my other pc and my pc booted up perfectly.

It took me a while to figure out that it was the power supply because when my computer stopped working one of the first things I did was test every pin in the 24pin and 4pin cpu plug. Everything was well within the ranges defined here:
http://pcsupport.about.com/od/insidethepc/a/power-suppl...

With the bad power supply my computer will turn on, but won't POST. So I used the bad power supply, turn the pc on, and tested voltages via the pins on the back of the motherboard. All were within the tolerances.

But it doesn't work.

I know I need a new psu, and I'm ok with that, but I'm frustrated that I can't figure out what the problem is coming from.

Anyone have any clue why the old power supply isn't working for me?

More about : figure power supply work

August 29, 2014 4:55:12 PM

Specs?
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August 30, 2014 6:34:30 AM

ep-45t-ud3lr
Q8400
Gtx260
700w of mod x stream psu

The power supply has worked for the last 5 years, so I know it can handle my build. I just can't figure out why it stopped working.
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August 30, 2014 6:54:58 AM

Could just be failing.

5 years is good for PSU.
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August 30, 2014 7:58:32 AM

Yes. I know it is failing. I told you that.
I'm just curious if anyone knows what would cause it to not work even though the voltages are within the official tolerances. I like to know how things work (or in this case how things don't work).
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September 16, 2014 3:02:25 PM

There isn't always an exact reason. It could be a list of things Ranging from A-Z narrowing that down would take a while. better off getting a new PSU and moving on.
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less than a minute ago

Generally the most likely culprit would be the aging capacitors slowly going out of tolerance. Could be many other things, just not nearly as likely.
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!