Fans start for half a second then whole system shuts down: first time builder

ninepintcoggie · Sep 5, 2015

Hey everyone. First time builder here. So I made an external build with my parts to make sure it all worked, and it went fine, got a bios screen, great. Then, i installed it into my case, and when i hit the power button, the fans run for half a second then the whole system shuts down. I replaced both the motherboard and the psu, and the issue persists. I have tried it will all parts, one ram, no ram, nothing. Please help!
Parts list below
http://pcpartpicker.com/p/kBsQWZ

alexoiu · Sep 6, 2015

Hi, As it looks like a short, check the standoffs, Each of them should match a board screw hole.

ninepintcoggie · Sep 6, 2015

alexoiu :

I tripled checked, all holes that should have a screw in them do.

alexoiu · Sep 6, 2015

Try taking the board outside the case and posting a picture of the case's side panel (where the board gets mounted).

ninepintcoggie · Sep 6, 2015

alexoiu :

alexoiu · Sep 6, 2015

It looks ok. In the 1st picture, top left side, there are 2 white spots. Are those standoffs, or holes?

ninepintcoggie · Sep 6, 2015

alexoiu :

If I'm picking the right white spots, they're the backs of case screws.

alexoiu · Sep 6, 2015

Try installing the board, but not tightening the screws all the way in. See if still no go.
Are there washers http://ecx.images-amazon.com/images/I/61yRxKgldiL._SY355_.jpg in the package?

ninepintcoggie · Sep 6, 2015

alexoiu :

Nope, no washers. Tried it like you suggested, no dice. External build doesn't work either, same issue.

alexoiu · Sep 6, 2015

Then the issue is elsewhere.
With the board outside the case, leave only CPU and CPU fan installed, both 24 and 8 pin power cables connected. Start the board by shortly touching with a screwdriver the 2 pins on the motherboard corresponding to the case power button.
See if the CPU fan does spin without stopping.

ninepintcoggie · Sep 6, 2015

alexoiu :

Yeah, that's how I've been testing my external builds. Initially, with my first external build and my first motherboard, i got a bios screen, so i went ahead and installed it into the case. I tested it inside the case and that's when the issue started. Tried an external build with your suggestions and the new motherboard and psu and the issue persists

alexoiu · Sep 6, 2015

If removing the 8 pin power cable, connecting a case fan to the motherboard and starting the board, does the case fan spin?

ninepintcoggie · Sep 6, 2015

alexoiu :

Yes, for half a second like before. I tried all the appropriately labeled pins with a case fan i had, same thing. PSU fan also goes for half a second. Essentially, computer seems to start starting for a second then shuts down. This is all tried with an external build on a linoleum floor

alexoiu · Sep 6, 2015

Then it might be a power supply issue. Try https://www.youtube.com/watch?v=5FWXgQSokF4
See if a connected fan does spin. If not, I suggest RMA-ing the power supply.
If it does spin, then it could be a board issue.

ninepintcoggie · Sep 6, 2015

alexoiu :

That's the kicker: I've replaced both of them after the issue and it persists. Both PSUs tested fine too

alexoiu · Sep 6, 2015

You've replaced both PSU and motherboard?

ninepintcoggie · Sep 6, 2015

alexoiu :

Yep. Thankfully for free, but still frustrating.

alexoiu · Sep 6, 2015

Then it might be a defective CPU shorting/damaging the board. Since the PSU does work, I suggest RMA-ing both board and CPU. If possible.

ninepintcoggie · Sep 6, 2015

alexoiu :

UUUgh that's going to take foreverrr. I should be able to return the processor, but the motherboard might be a bit trickier; i returned the first in store already after the 30 day mark saying it was faulty.
What I want to know is how to prevent this from happening again. Since it worked when I did my very first external build, I'm fairly sure that I mucked it up somehow. Any tips for how to avoid that next time?

alexoiu · Sep 6, 2015

Try avoiding holding the board by the CPU cooler. Make sure that both 24 and 8 pin power cables are properly connected. Turn on the PSU only after making sure that all cables and components are properly connected.
Check also http://www.tomshardware.co.uk/forum/274745-31-step-step-guide-building or similar videos/tutorials

Fans start for half a second then whole system shuts down: first time builder

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