Just assembled PC, will not boot

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Free Radical

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Jun 24, 2014
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Putting together second computer, and bought the following parts (omitted the Optical Drive, OS, etc.):

MoBo: ECS H81H3-I/HDMI (V1.0) Mini ITX LGA1150 Motherboard
CPU: Intel Core i3-4330 3.5GHz Dual-Core Processor
GFX: Gigabyte Radeon R7 260X 1GB Video Card
RAM: Crucial Ballistix Sport 4GB (1 x 4GB) DDR3-1600 Memory
PSU: Corsair Builder 430W 80+ Bronze Certified ATX Power Supply
SSD: Crucial M500 120GB 2.5" Solid State Drive
Case: Cooler Master Elite 130 Mini ITX Tower Case

When I finished assembling the PC, plugged it in, and powered it on, the computer would receive power for a split second, and then immediately shut off. I replaced the motherboard, thinking that was the problem, and started going one step at a time.

I now have the PSU, case, and MoBo plugged in. I can power it on, and the PC will run (fan spins on PSU). However, when I put in the CPU + CPU fan, the computer goes back to powering on for a split second and immediately shutting back off. I figured at this point that it must have been a bad CPU, so I replaced it. Just received my CPU in the mail today, put it in, and it's STILL doing the same thing.

Does anyone know what could be the issue here?
 
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millwright

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Jul 1, 2007
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You have a short circuit some ware, usually it is the mother board hold down standoffs.

When a computer starts and immediately shuts off, it is usually the circuit breaker in the power supply tripping.
There is no sense in testing without ALL the minimum parts installed.

Test minimum parts outside the case, on a non conductive surface.

Minamun parts
Motherboard
1 Stick of RAM
Power supply
CPU, and cooler.
Video card if no onboard.
Monitor.

If it works then, check the standoffs are in the right place

 
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Free Radical

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Jun 24, 2014
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I do not know which version of the PSU I have. Like I described in my original post, the PSU + MOBO + Case combo works, but as soon as I add the CPU and fan in, I run into the problem.
 
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Free Radical

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Jun 24, 2014
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I tested outside of the case, and that did not change what happened. As soon as I press the power button, I get power for less than a second, and it immediately shuts back off.
 
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millwright

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On one of my more stupid days, I had the CPU12v plugged in backwards, and it did the same as you said.

Unfortunately the only way to test is substituting parts, one at a time.
Your min parts in another computer, or known good parts one at a time in your computer.
Even a computer shop tests this way.

Before I had shelves of spare parts for testing, I would take them to the local computer shop, and they would test them for free.
Most shops have test bench machines for just that.

Although that was 30 years ago.
 
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