Computer boots for one second, then turns off

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aizakow

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Mar 22, 2014
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Hi guys,

I just finished putting together a new pc:
BitFenix Prodigy
Intel Core i7 4770k
Gigabyte NVIDIA GeForce GTX 770 4GB
G.SKILL Ripjaws X Series 16GB (2 x 8GB) 240-Pin
Gigabyte GA-Z87N mini ITX motherboard
Samsung 840 Pro Series SSD and Seagate 2TB Hybrid drive
Seasonic SS-760XP2 760W PSU

I have finished assembling the computer, but when I go to turn it on, the computer boots for 1 second, then turns off. While on, the CPU fan and system fan start spinning, as well as the GPU fans, and I can hear the hybrid drive spinning up. One second later, all of this stops. This repeats until I cut the power.

To address some common problems:
I have made sure that I have connected the 4-pin CPU power connector on the motherboard.
I have removed the GPU and the hard drives to power the bare minimum components necessary.
I have tried booting with no RAM or one stick of RAM
I have removed and reseated the CPU, and I am reasonably sure there are no bent pins and the thermal paste has not leaked onto the circuitry

The problem seems to be that the system does not recognize that there is a CPU plugged in. Whether this is the fault of the CPU or PSU I can't tell.

Any advice would be immensely appreciated!
 
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millwright

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Jul 1, 2007
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If the CPU wasn't plugged in nothing would happen.

At first glance it is either a short from the motherboard to the case, or a sticky start button.

Dose it start again as soon as you plug it in.
If not, it is probably not the start button.

More likely you have a stand off in the wrong place and the board is shorting.
The 1 second and reset is the circuit breaker inside the power supply.

Take the board out of the case and test on a non conductive surface.
If it works outside the case, it is probably a short
 
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aizakow

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Mar 22, 2014
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Thanks for the reply.

It does start again after a few seconds. I am pretty sure the power switch is connected correctly.

I have removed the motherboard from the case and placed it on a nonconductive surface. It shuts down after 1 second, as before. Is there another possible reason for a short?
 
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aizakow

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Mar 22, 2014
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I just tried hooking it up to a different PSU, while resting on a nonconductive surface, and nothing has changed. Does this mean the motherboard is the problem?
 
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millwright

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I plugged the 4 pin CPU plug in wrong, and it did that.

Dose it start by itself, after a few seconds?

If everything is plugged in correct, and it still doesn't work outside the case, with min set up, then one of the components is probably bad.

The only way to test is try your min components in another computer, or try known working components in your computer 1 at a time.

Unfortunately even a computer shop tests this way.

Many years ago, before I had spare parts, I would take my questionable parts to a local shop, and they would test them for me.
 
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millwright

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To test the power switch, disconnect it, and short the 2 pins, for a second.
If it starts and runs, the switch is stuck in the on position.
Power switches have no polarity, so as long as you plug it into the correct 2 pins, either way is right.
 
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aizakow

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Mar 22, 2014
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How do I short the 2 pins? Sorry if that's a stupid question.
 
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aizakow

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Mar 22, 2014
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Okay, I have shorted the pins to turn the system on. Unfortunately, the problem remains.

Sounds like my best bet is to take this to a computer shop at this point?
 
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millwright

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If you have no other way to test.

You might want to take just the min parts.
If you bring the whole computer, they will probably charge a whole lot more.

The shop I used to go to, never charged me for testing, as I occasionally bought parts there.

Edit
They can't test the motherboard, but if everything else checks out, it probably is the board.
 
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