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PSU fault?

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#1
Hello guys, usually I try to solve all my issues on my own and by searching the internet and the forum. This time though I need some advice from the best, hence my post.

I used to run an i5 4590 on a h81 motherboard, with 16GB DDR3 RAM and a gtx 970 (+150 core and +250 mem)

The PSU is a evga 650 GQ which is one year old.

This system was rock stable and has never had any issues with power delivery.

I bought an Asus x99-s motherboard (latest not beta bios), 16GB Kingston predator ddr4 3000 MHz and a core i7 5820k.

Now the issue is: when i swapped out the old components with the new X99 ones, i started having issues. Specifically it would shut off suddenly, no errors, no bsods, straight up power off. The motherboard still has power after these shut downs (as indicated by the LEDs and power on and reset switches on the mobo).

This happened both in bios, on stock settings, after clearing CMOS (removed battery too), during windows booting, during using firestrike and by simply being idle.

The thing that puzzles me is that I left it run occt for half an hour and it ran (CPU+GPU test), linpack, unigine heaven, prime95 and intel xtu test - all passed.

After it shuts down, I have to turn off the psu from, as it doest react to pressing the power on buttons (neither the ones on the case, nor the ones on the mobo). Then it starts up and boots. But the issue remains.

My question to the more experienced: anyone has any leads? I thought it might be the PSU (but seeing that it worked fine in the old system, I am skeptical that it is it at fault)

Thanks!
 
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#2
If it were me in your position, I would totally disassemble and then reassemble the computer.

While doing that, I would Power it on with just minimal components installed and test for stability. Meaning one stick of RAM one storage drive the cooler ,and run on the internal GPU if you have one. It sounds like it could be a power supply issue, but there's no definite answer, and troubleshooting is never fun especially when you don't know the specific problem your looking for.
 

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#3
I had this when I tried to run my i7 and a 295x2 off of a 650W PSU. Once it got going in a game it would shut off without warning. But that was a power hungry dual GPU card. I can't imagine 650W not being enough in your scenario.
 
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#4
I've ordered an EVGA 850 GQ to see if the PSU is the issue.
Ran stress tests again, on the old system - no issues.
This is not fun at all.

In the meantime, will try the minimal hardware approach, as suggested.

Edit: another way to get it to post is to press the clear cmos button and then reset
 
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#5
It is important to note that cases are designed to support 1000s of different motherboards of different sizes. And while the ATX Form Factor standard dictates where motherboard mounting holes and case standoff mounting hole "can" be, the standard does not dictate where they "will" be. Cases typically have more motherboard mounting holes than motherboards do. And not all motherboards have mounting holes in each possible location.

Point being, it is not uncommon for newbies and pros alike to accidentally insert (or leave in with your scenario) an extra standoff or two in the case when installing or replacing the motherboard with a different board. This then often results in one or more motherboard circuits being shorted to ground through the extra standoff(s). Because most board makers spray a protective anti-corrosive resin layer on the board, this shorted ground connection may be intermittent.

So I agree with jboydgolfer and recommend you pull the motherboard. Assembling it on a large, unfinished breadboard (or plain brown cardboard) outside the case to see if it works will be very informative.

Then verify you only have a standoff in the case where there is a corresponding motherboard mounting hole.
 
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#6
verify you only have a standoff in the case where there is a corresponding motherboard mounting hole.
This. (easy to understand, the best explanation I've seen yet)

Having an errant/extra unneeded brass mount in your case with the motherboard's circuits and traces resting on it shorts out parts of the board.
Check this first by booting the board out of the case as Bill said.
 
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#7
After it shuts down, I have to turn off the psu from, as it doest react to pressing the power on buttons (neither the ones on the case, nor the ones on the mobo). Then it starts up and boots. But the issue remains.
if you go to the control panel > power options, look on the left towards the top. It was Choose what power buttons do. Set them how you want, there is also holding the power button down for 7+ seconds to power down immediately.

Edit:Also, while you are breadboarding, check the the CPU/socket for bent pins.

This. (easy to understand, the best explanation I've seen yet)

Having an errant/extra unneeded brass mount in your case with the motherboard's circuits and traces resting on it shorts out parts of the board.
Check this first by booting the board out of the case as Bill said.
count the screw holes in the motherboard, then count the brass studs. :D
 
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#8
count the screw holes in the motherboard, then count the brass studs.
And most important, check that the stud's locations match the holes in the motherboard. Remove any extra studs.
 
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#9
Socket is clean, all pins are ok. I have tried to boot it up with just one stick of ram, same behaviour.

After these shutdowns it doesn't react to the power buttons (both the onboard ones and case ones) even if I hold them pressed.

Now it doesn't even boot into Windows.
 
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#10
Socket is clean, all pins are ok. I have tried to boot it up with just one stick of ram, same behaviour.

After these shutdowns it doesn't react to the power buttons (both the onboard ones and case ones) even if I hold them pressed.

Now it doesn't even boot into Windows.
Did you take the motherboard out of your case and try it out?
 
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#11
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#12
Did you clear your BIOS too?
Running out of suggestions.
You'll probably need that new PSU that you ordered.
Be sure to send the EVGA 650GQ in for repair if the new PSU eliminates your problems. It has a 5 Year warranty.
 
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#13
Did you clear your BIOS too?
Running out of suggestions.
You'll probably need that new PSU that you ordered.

Yep, cleared and reset it countless times, no progress.
I guess that's what's left now, I'll post an update once I test it.
Thanks for trying though.
 
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#14
So, I got the PSU
It didn't want to boot at all to start with, the mobo sat there with code 00
I reseated the CPU, inserted one ram stick and it started running post codes, I put in my GPU, connected the HDD, and it booted into windows at stock settings
Ran linpack xtreme 64 bit and it said "hardware failure detected", didn't crash though.

edit: it shutdown again, does it even in bios.

what do you guys think I should take out of this?
 
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