My computer is turning on and then off over and over again

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TheRadical1

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Dec 17, 2013
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Last night I left my computer on over night because I was downloading something. I woke up around midnight to the computer turning on and off and on and off continually until I turned it off at the wall.

I tested it again this morning and the computer ran fine for about 10 minutes and then just randomly shut down. Then after a couple seconds the fans spun up and the computer began to boot and then it turned off again and this repeated.

I have checked if the power button is jammed in, and it isn't. I recently tested the power supply voltage with a multimeter and that was all fine, however I added a few new fans and a fan controller to my case recently, could that be the issue? The power supply should be able to handle them. However my computer has been turning off randomely lately so I'm worried if the power supply is the cause?

Here is my build:
Intel i5-4670 CPU
AMD rx-470 GPU
ASRock Fatal1ty H87 performance series Motherboard
16Gb of ram
2x SSD's
1x 1TB HDD
1x DVD RW drive
1x fan controller
5 case fans and 1 CPU fan
PSU: Cooler Master G750M bronze


All help is greatly appreciated.
 
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TheRadical1

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Dec 17, 2013
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The problem didn't start straight away after adding a fan controller and fans, but after a week or so. So the fan controller and fans could have an impact. they are the latest thing I added to the computer.
 
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TheRadical1

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Dec 17, 2013
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I have unplugged the entire power supply, reseated the ram and graphics card and all of the cords and now the computer is working again. However, have noticed a couple issues:
- a few of my new fan LED's are blown
- After benchmarking and stress testing my graphics card at stock settings it is showing quite a performance decrease compared to before the incident. This is not good as my graphics card is new. So frustrated right now, not sure if I can RMA my card.
 
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TheRadical1

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Dec 17, 2013
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Hey VIC 40, thanks for the reply.
I used my brother's 450W power supply with only the GPU and RAM connected (along with the motherboard and CPU fans of course). It's not a great PSU but i know that it works and so should have had enough power to start the computer.
4 of the case fans are controlled by the fan controller.
I did not try to clear the cmos, how would I do that? And what does enabling XMP do?

 
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Vic 40

Vic 40

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Oct 22, 2013
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Okay.



These which are having led issues?



There's a jumper on the motherboard that does this,which one and how to can be found in the motherboard manual or take the motherboard battery off for about 5min. and after that put it back.
 
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Gniakaris

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May 26, 2015
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I had the same issue,
In my case the RAM was the problem. I used to try the other ram slot and the pc booted up with no display/windows load. I did not replace it, in the same slot, I reseated it again and again until the pc booted up fine. No problems so far!

Good luck!
 
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TheRadical1

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Dec 17, 2013
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Thanks for the help so far guys, I will attempt to reset the cmos when I get the chance.

One of the case fans has the LED problem, Vic 40.

Also perhaps ram was the issue for me because when I re-seated it the problem was solved. However I also re-seated my graphics card and re-seated some power supply connectors so I'm not completely sure.

Anyway, the computer is working but my graphics card is no longer stable so it seems that the power issue must have affected it somehow, so that is my main issue now.
 
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TheRadical1

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Dec 17, 2013
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I mean that before the event happened I had my graphics card on stock settings and had tested the card multiple times on 3DMark stress test to check the stability of the system and got 99.8%.
Before that I had my graphics card overclocked slightly and still had 99.8% stability.

When my computer worked again I tested my graphics card a few times on 3DMark on stock settings and only got 97.4% stability (it only just passed the test as the test fails at 97%). Then to prove it, I tested it at it's previous overclocked settings and had lots of artefacts and frame rate drops occurring, and the test failed.

So something has affected my graphics card or some other part of the system that links to the card (at least that is my conclusion?).
 
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