Computer turns on for a second and then immediately shuts off

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Dragonuave

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Nov 13, 2013
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I have been building a computer, and I just got my PSU and Motherboard. When I connect all the power cables (fans, power button, reset button and HDD leds) to the motherboard and try to start the computer, the fans spin, the leds turn on for about a second, and then suddenly turn off. Why?

The PSU I am using:
http://www.amazon.com/Corsair-Enthusiast-Series-Modular-TX750M/dp/B005E98FVS

The Motherboard I am using: http://www.amazon.com/MSI-MicroATX-Motherboard-H61M-P31-W8/dp/B0097WLXW6

The Case I am using: http://www.amazon.com/NZXT-Guardian-Tower-Black-921RB-001-BL/dp/B004351H9G
 
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Dragonuave

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Nov 13, 2013
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That I did, and now that it is plugged in, the problem still persists.

 
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Dragonuave

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Nov 13, 2013
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There is no way I could use a 6 pin on my 4 pin connector without being a complete idiot :p My PSU came with a 6 pin and a split able 8 pin, I split the 8 into two fours and tried and it didn't work, thus I gave the reply that it didn't work. I switched the two and it works fine, after you posted your most recent solution. But thanks man, you saved me from a bunch of restless nights. :)
 
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Dragonuave

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Nov 13, 2013
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Problemo! It worked last night, but now when I try and turn it on to see its beauty, it has the same problem! I checked to see if the atx and cpu power cables were in, and they are! Help!
 
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mazout360

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Nov 6, 2013
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Definitely a power issue. You'll have to double-check with your motherboard manual/specs and PSU specs to make sure the voltage/amperage is adequate for your CPU/ATX connectors. Of course, make sure everything is connected correctly.
 
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Dragonuave

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Nov 13, 2013
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The weird thing is that if I let it sit for a bit, and then try, it starts right up no problem. That's what makes me think it's the psu's fault... now i'm concerned that I plugged too much power into the mobo, because I don't know how many volts go through atx and cpu power cords...how would I find out its safe?

 
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