random black screen from gpu and flashy colours from igp

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29 Dec 2012
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Hi, couple of days ago I had a strange issue on my pc, I was watching a youtube video and suddenly one screen went black and the other just started flashing all random colours. I rebooted and the same thing happened again within minutes, and now of course I can't make it happen again on camera.
It has just happened again 2 days later but this time it seems to be a single event.
Theres no way its an overheaing issue as it has a custom watercooling loop which is running extremely well, nothing ever gets above 50c. And it isnt leaking, which is the first thing i checked. and also the problem doesnt happen when the system is under any particular amount of stress, it has happened twice on youtube and once on facebook so just egeneral web browsing.

The specs are:

msi z77a g45

core i5 3570k

msi r9 290 reference card

16gb avexir core blue ram

corsair evo 540 250gb ssd

1tb wd carviar black storage drive

rm750 power supply.

custom watercooling loop.

24G7lkq.jpg
Please keep images to below 1280px wide or post in
tags like I've done for you above - Rilot
It has been running fine in its current state for months and before that when it was just a cpu watercooling loop and air cooled graphics card it had been running for over a year without issue. All drivers are up to date.

No idea what the cause is but I know it shouldnt be doing it.

just to clarify the monitor that goes black is on the graphics card output wheras the one that flashes all manner of colours is on the integrated graphics output.

dont suppose any of you know a cause?

cheers,

Smithy ;)
 
i'll give it a go cheers,

also the problem seems to have developed into a somethign else. I no longer get the flashy screen but what does happen is the pc will randomly just power off for no apprant reason, then reboot itself after a few seconds. It isnt a crash any more I just hear the power supply click off then it comes back on again.

EDIT: Feel like a moron now but it seems this last issue was a loose 24 pin connector causing intermittent shut downs, remains to be seen if its the case as it is hard to confirm the absense of an intermitent fault.
could a loose 24 pin also cause the original issue of black screen and colourful screen?
 
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