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Bad power supplies, or evil motherboard?


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#1 TunaSalad9

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Posted 27 September 2017 - 01:21 PM

TL;DR: Power supply was working, put computer to sleep, power supply went dead. New power supply was working, did not put computer to sleep, power supply went dead. Is the problem two faulty power supplies or a motherboard from hell?
 
Over the past week I've run into a problem with a couple of power supply units, or potentially the motherboard. The best way to describe this problem is to describe the chain of events in order:
 
- Computer is functioning normally for years. I put the computer into sleep mode and go to bed.
- The next morning the computer will not power on.
- The power supply, NZXT HALE90, makes it's usual "click" sound, but no power.
- There is also no power when attempting to power on through the motherboard's power button.
- The motherboard LED light does go on when the power supply is switched to "on".
- The power supply is removed, tested with multimeter/paperclip trick: No power.
- A new power supply is purchased, a Corsair gold-rated unit.
- The power supply is connected to the computer. It powers on successfully and the computer works.
- The power supply had something like a "hiccup" when powering on. Powered on, then off, then on again.
- This also happened to my first power supply (HALE90) the first few times using it back in 2013.
- Computer continues to function normally for the next couple hours. No problems to report during usage.
- I fall asleep with the computer still on. Upon waking up, the computer is now off. The monitor is still on.
- The computer will not turn on. The fan will spin for half a second, but no power.
- As before, the motherboard LED goes on when the power supply is switched to "on".
- The power supply is removed, tested with multimeter/paperclip trick: Power cuts within half a second.
 
And that's where I am right now.
 
The case is a CoolerMaster HAF, the motherboard is an ASUS P8Z68 model, the video card is a GTX 580.
 
The computer is connected to a surge protector that still tests as "protected". There were no power outages during this time, the monitor itself stayed on in the second scenario, and no other electronics connected to the outlet are showing any effects.
 
From my perspective there are two possibilities here.
1) My original power supply simply gave out, and I just happened to purchase a faulty power supply that only worked for a few hours.
2) My motherboard or some other component is malfunctioning in a way in which the power supply is getting damaged.
 
My intuition is of course the first option, but I've been unable to find enough information on my own to rule out the second option. Is that even possible? Is there another option I'm missing? I've now purchased a 3rd power supply. My fear is that if something is wrong with the computer I could burn out the new power supply.
 
What explains all this and what should I do? Thanks in advance.


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#2 mjd420nova

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Posted 27 September 2017 - 03:21 PM

I'm more inclined to begin looking at your power source for the PS.  The 110V AC may have a reversed polarity or a ground loop that is taking out the PS protection of itself.  You may also have a heating/cooling cycle that is temporarily  shorting the PS.



#3 The-Toolman

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Posted 27 September 2017 - 05:58 PM

Although your power supply is connected to a surge protector which shows it is ok that may not be the case.

 

I recommend buying a battery backup or at least replace the surge protector if it is more than two years old.

 

It is possible that you purchased a defective power supply and it is also possible that something inside of the computer is taking out the power supply.

 

Are there any bloated capacitors or ones that have swollen tops or leaking around the base of them.

 

Capacitors can short although usually will explode when they short but not always the case.

 

Look the motherboard over very well for any components that may appear to look burnt.

 

Unplug all devices as CD/DVD rom / hard drive / also remove graphics card.

 

Unplug all case fans except the fan on the processor heat sink but check to see that it spins freely without any restriction.

 

Also check all other fans to see that they spin freely without any restriction.

 

A frozen cooling fan that doesn't spin could take out a power supply but it is rare that I have seen that although possible.

 

If you have integrated graphics capability on the motherboard then connect monitor to that and then only connect power connectors which are needed to power motherboard and nothing else.

 

If no integrated graphics on motherboard still leave graphics card unplugged and removed for testing.

 

Then power up computer and see what happens and yes there is a possibility of blowing out another power supply if there is still a problem on the motherboard.


Edited by The-Toolman, 27 September 2017 - 07:26 PM.

I'm grumpy because I can be not because I'm old.

 

The world is what you make of it, if it doesn't fit, you make alterations.

 

Under certain circumstances, profanity provides a relief denied even to prayer.  (Mark Twain)


#4 The-Toolman

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Posted 27 September 2017 - 06:54 PM

Does you processor have integrated graphics.

 

It appears your motherboard graphics is supported only by CPU with integrated graphics.

 

Your original power supply appears to have been a good capable one.

 

I'm kinda leaning towards a failed graphics card as that uses 200 watts of power from what I could find on line.

 

If a component on the graphics card shorted that could create a large enough load on the power supply to perhaps cause it to fail.

 

This is why I recommend removing graphics card and see if the computer will power on and stay on.

 

Again there is always a chance of popping the power supply.


Edited by The-Toolman, 27 September 2017 - 07:04 PM.

I'm grumpy because I can be not because I'm old.

 

The world is what you make of it, if it doesn't fit, you make alterations.

 

Under certain circumstances, profanity provides a relief denied even to prayer.  (Mark Twain)





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