Very unsual problem with Computer booting once every "Insert Random Number"

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DenisCo

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Aug 19, 2014
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I`m honestly going crazy. Here`s the problem. (BTW this problem started appearing 2 years after buying my whole rig and never did I change any parts before the problem started occuring).

THE PROBLEM
Say by magic I managed to turn my pc on. I could place bets on whether it says on for 5 minutes or for 12 hours. Usually not more or less than within this range. The PC shuts down under heavy load or when completely idle.

WHAT I`VE TRIED SO FAR:
1. I`ve tried swapping position/removing some ram sticks to find faulty sticks. To no avail unless all 4 went bad, yet the PC still turns on every 100 tries so I ruled that out.

2.Changed the PSU, fixed the issue for a month. Then it started again

3. Changed the CPU cooler because CPU was dangerously hot, Solved my issue for two weeks.

HOW I MANAGE TO GET MY PC BOOTING AGAIN
I`ll use my PC and it just randomly shuts down on me. The only way to get it on is to turn off the PSU power switch, unplug and replug the main mobo power cable, reseating it, flip the switch back on and cross my fingers this time it`ll boot. Sometimes it takes 5 tries, Sometimes it takes 100.

WHAT THE MOBO IS TRYING TO TELL ME
I have an Asus Sabertooth P67. The LED`s that are on when the computer will not boot are the CPU LED and the DRAM LED. None are blinking, just constantly on. MemOK does nothing for me.

I literally don`t know the source of the problem and how to figure it out. Although the LEDS point to ram and or the cpu the simple fact that I can manage to make it boot until it crashes again makes me think it`s not the issue at all.

All help to fix this nightmare of a computer is deeply appreciated
 
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DenisCo

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Aug 19, 2014
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I`m going to try it immediatly and fill you in on results

UPDATE: Tried it on wallplug on the other side of the house, to no avail still didn`t boot
 
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DenisCo

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Aug 19, 2014
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I updated the BIOS the very first time I set up my entire rig. May it be there might be a newer version to that by now. Not sure if I should fiddle with that just yet. Also my current PSU is a XFX 850 watt. The original one was an Antec 750watt

 
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DenisCo

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Aug 19, 2014
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Would a corrupted BIOS cause my PC to shutdown randomly tho? It would seen weird that it would cause my PC to shut down 5 minutes in or sometimes a few hours later. But i'm not savy on BIOS so I may be wrong
 
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Outlander_04

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Nov 18, 2008
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Not that I have ever seen .

Normally you'd expect sudden shut downs to be because of heat , and probably an issue with the psu .
But you have replaced it and still get the problem .

Have you got good air flow through the case?
Air has to have a way in and a way out . But I have seen people trying to suck air out everywhere and no flow was actually happening . Have you tried running the pc with the side of the case off?

And I still think a BIOS update is a good idea .
 
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DenisCo

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Aug 19, 2014
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So i tried the update the BIOS, still have the same issue. Tried running it with the case open and still have the same problem. I can guarantee it's not heat because this happens when it's idle too and it runs very cool. I wouldn't rule out the PSU just yet. I changed it 6 months ago. I solved the issue for a few months but... I don't know. My case has an unusual scheme. The PSU is on the floor and I have dogs that gather lost hair like no tomorrow. I wonder, would it be possible for hair to creep inside the PSU and ruin it/short circuit it?

As for PC parts off the top of my head
Asus sabertooth p67
i7 2600k cpu
2x4gb Patriot DDR3
2x4gb Corsair DDR3
XFX 850 Watt PSU
2x Western Digital 1TB harddrive
Alternating between an ASUS 570 GTX and an EVGA 660TI (Recently the 660TI has given out, probably shorted and died or the heavy Double Action Asus is so heavy the weight of it bending downwards has damaged the chips on top of my 660TI when they were both installed, because the 570GTX is a 3 slot big ass graphics card)
 
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anbello262

anbello262

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Sep 27, 2013
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Maybe it has somethjing to do with the RAM. Try to install just one set at a time. For example, use only the corsair RAM for a while, and if the problem persists, use only the patriot adn try again.
Plug only 1 graphics card, the one still working. Uninstall the one not working.

Report back after that :)
 
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DenisCo

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Aug 19, 2014
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I already swapped the graphics card so I can rule that one out. They both worked individually and the same issue occured.
As for the RAM... I tried removing some and using it one at a time. The issue is the PC will boot once out of 100 times and lo and behold it still shuts off so I'm almost 100% sure its not the RAM.

I have a gut feeling it's either the PSU or the MOBO. But it's hard to understand how or why. Why would the problem dissapear when I installed a new PSU about 6 months ago and restart suddenly. I thought the first PSU was then broken but could the second PSU have already been broken? Is dust/animal hair perhaps creeping in probable to breaking or short circuiting a PSU?(Because the PSU in this case is facing the floor). Figuring out what it is considering the fact that i AM able to boot my pc (in a very inconventional way) And it can stay on between 5 minutes to 24 hours makes it really difficult to figure out what my problem is....
 
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anbello262

anbello262

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As for the PSU, i would recommend getting a cheap dust filter. That would keed the hair away and save you some trouble in the future. Better to spend $5 now and avoid problems in the future.
Still, I don't think that's the problem, but I can't tell unless you have a replacement nearby, and can test...
 
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DenisCo

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Aug 19, 2014
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Lo and behold. I completely forgot I had a 650w PSU from my older build years back. Swapped it out and boom it works. So it truly is 2 PSU's that died in 1 year. First lasting 2 year and the second lasting me 6 months. The worst part? I have a dust filter.... I just don't really understand how or what about having the PSU on the floor seems to like condemn my PSU's to sudden death(as in dust still infiltrates somehow past the filter or something about the case grounding). I can tell you one thing it's the last time I buy a case with the PSU on the bottom and especially a rosewell 50$ cheapass case when I forked out 2k for the rest of my components. It'll teach me to cheap out on that -_-
 
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anbello262

anbello262

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Actually, a PSU on the bottom is a very good thing, usually, because of heat problems...
Most gamer cases have their PSUs on the bottom. I really don't understand what could have caused your problems...
Maybe one of your dogs decided to mark the PC as their territory? :p
 
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