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My recent build won't power up for more then 1/2 a second.

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Hey, I finished this build about 2 months ago and everything was pretty much fine (had some video issues, non related). Last night I powered down my computer and it was fine. This morning i try to turn it on and the power flashes on for a second and shuts off. The fans also start spinning for about a half second. Does anyone have any idea what to do?

Specs are : asrock xtrem4 gen3 motherboard
intel i-5 processor
900volt power supply
2 evga 560 ti video cards.
I'm very new at this so if you need any more specs please just ask.

Thanks alot for your help in advance.
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Hi galacis and :welcome:
Best couple of suggestions I can make would be first remove the MB and do a barebones set-up on a piece of cardboard (make sure it is larger than the MB) only connect the PSU, the GFX card, 1 stick of Ram and the keyboard.
You will then need to short out the 2 power on pins on the MB header to get the PSU to activate( unless your MB has a power test button) you can use a small flat bladed screwdriver or a paper clip bent into a U shape, this is perfectly safe if you do not touch anything else, the idea is to see if we can get a BIOS screen if you do you can then add one component at a time until you find the problem component, you must power down and remove the power cord from the wall before adding a component, second suggestion try a known working PSU.
Other things worth checking include, if you used stand offs beneath the MB are they in the correct locations (only where there is a screw hole in the MB) otherwise the MB will short out, check for stray screws or bared wires for the same reason.
What is the brand of your PSU and did you correctly apply TIM (thermal interface material) when you did the build?
Tutorial courtesy of Digerati http://www.geekstogo.com/forum/topic/292223-thermal-interface-material/
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