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New PC build - diagnosing motherboard issues

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  • Motherboards
  • Light
  • Corsair
Last response: in Motherboards
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December 22, 2013 4:18:43 AM

My specs are
Z87 G45 Gaming
Haswel i5 4670
16g corsair Ballistix DDR3-1600
HD7870 Graphics
Corsair PSU CX600M

I built a new pc but it wouldn't post, just the motherboard light (I think this is an audio light) and case fan turned on for only 2 seconds then died. I tried another PSU and the same thing happened. I managed to boot it up fully once, but then I turned it off immediately. I tried again just to make sure it wasn't luck, and as expected it failed like before.

So, I took it apart to try and diagnose the problem. I figured the first step would be to test if there is a motherboard problem.

So my question is, do I need to assemble it fully (processor with cooler, and one stick of ram) to test it, or should the light on the motherboard and case fan turn on with only the 24 pin power connector and the case fan plugged into it?

Thanks in advance for anyone who can help.

More about : build diagnosing motherboard issues

a b V Motherboard
December 22, 2013 5:27:04 AM

that dont sound good to me , carefully check to see if you bent pins when you installed the cpu. that seems like an issue with these intel boards. for what i been readind in reviews that got bad boards it seems that one of the things to check[?] i never built a intel [amd fan boy] but i looking to do one and the msi is one i like. so any way it seems that bent pins in the scocket is easy to do and can cause these issues. if not i will try to help you move on if i can
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December 22, 2013 6:13:17 AM

junkeymonkey said:
that dont sound good to me , carefully check to see if you bent pins when you installed the cpu. that seems like an issue with these intel boards. for what i been readind in reviews that got bad boards it seems that one of the things to check[?] i never built a intel [amd fan boy] but i looking to do one and the msi is one i like. so any way it seems that bent pins in the scocket is easy to do and can cause these issues. if not i will try to help you move on if i can


The pins seemed okay, I put the processor and cooler back onto the board and 1 stick of ram. I connected the 24 pin into the motherboard (I think it's in properly, I had to push down hard. I worry It would snap if I press anymore). I connected the 8 pin into the PSU socket. One fan from the PSU to the board and 1 case fan to the board. Lastly the power led, powersw and reset buttons. Nothing else. Unfortunately it is all dead. I turn on the power and nothing happens. Before it was at least turning on (when it was all connected). So now I don't know if the power supply has died (it doesn't make any noise when plugged in but I don't know if that's supposed to be doing that until its under load) or the motherboard has died. The worse thing is I don't know what caused the problem with it shutting down in the first place AHH!).
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a b V Motherboard
December 22, 2013 6:56:50 AM

unless you got a knowen good psu to swap out it hard to tell or if you got a meter to check the psu leads to see if its putting out and to use the boards check points[i think your board has them] also be sure that the leads are pluged in correctly into the back of the psu as you did on the board. i looked at your psu at newegg and 3 of the last 10 reviews on it were doa's[??] but without a differant psu to try you just dont know.
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a b V Motherboard
December 22, 2013 7:01:23 AM

unless you got a known good psu to swap out it hard to tell or if you got a meter to check the psu leads to see if its putting out and to use the boards check points[i think your board has them] also be sure that the leads are pluged in correctly into the back of the psu as you did on the board. i looked at your psu at newegg and 3 of the last 10 reviews on it were doa's[??] but without a differant psu to try you just dont know.
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a c 559 V Motherboard
December 22, 2013 7:21:51 AM

Apart from the 24 pin power cable that connects with a 8 pin to the PSU, you should connect another 8 pin power cable to the motherboard (top left corner, near the CPU).
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December 22, 2013 8:46:14 AM

alexoiu said:
Apart from the 24 pin power cable that connects with a 8 pin to the PSU, you should connect another 8 pin power cable to the motherboard (top left corner, near the CPU).


I have a 24 pin plugged in (the main mobo power) and an 8 pin near the psu. You are saying there a third one as well?
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a c 559 V Motherboard
December 22, 2013 8:49:48 AM

Near the processor, you mean?
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December 22, 2013 9:38:31 AM

alexoiu said:
Near the processor, you mean?


Sorry, yes. Near the processor.
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a c 559 V Motherboard
December 22, 2013 10:19:31 AM

Hard to say then. I suggest testing the components at a local shop.
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a b V Motherboard
December 22, 2013 4:29:57 PM

i missed that you tryed an extra psu earlyer but seeing that if you got everything pluged in all the proper spots [check manual] things should be working. did you try it with out the vidcard and drives? if it runs and u go into bios and let it sit there awile and it dont shutdown then try it with the vid card and then each drive and if it shuts down when one of them get hooked up then its that hardware if it still dont work i would think yoor board may be doa. were did you buy this stuff?
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December 23, 2013 10:31:24 AM

alexoiu said:
Hard to say then. I suggest testing the components at a local shop.


I did as you suggested. Turned out to be a faulty power supply. It was turning on and appeared to be 'working' but it was not giving out the correct voltages. They were unstable. That's why sometimes I turned it on and it appeared to be working and other times it appeared to be totally dead. Thanks for the help.
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December 23, 2013 10:40:14 AM

junkeymonkey said:
i missed that you tryed an extra psu earlyer but seeing that if you got everything pluged in all the proper spots [check manual] things should be working. did you try it with out the vidcard and drives? if it runs and u go into bios and let it sit there awile and it dont shutdown then try it with the vid card and then each drive and if it shuts down when one of them get hooked up then its that hardware if it still dont work i would think yoor board may be doa. were did you buy this stuff?


It was a faulty power supply in the end, the rest of the components seem to be working okay. It was one I bought from amazon. Thanks for the help.
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a b V Motherboard
December 23, 2013 11:06:41 AM

well good glad your back going. sorry i did not give you the best answer. but all i can do is try
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a c 559 V Motherboard
December 23, 2013 12:55:50 PM

anykeys said:
alexoiu said:
Hard to say then. I suggest testing the components at a local shop.


I did as you suggested. Turned out to be a faulty power supply. It was turning on and appeared to be 'working' but it was not giving out the correct voltages. They were unstable. That's why sometimes I turned it on and it appeared to be working and other times it appeared to be totally dead. Thanks for the help.


Thank you for the follow up.
Good luck!
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Best solution

a b V Motherboard
December 23, 2013 3:25:41 PM

not to be rude but its hard to think that ''take it to a shop'' is best answer instead of helping him troubleshoot things and get some knolage under his belt and learn some steps to do for himself so he dont have to ''take it to a shop''
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a c 559 V Motherboard
December 23, 2013 3:53:16 PM

I don't really care about it (best answer selected). I do care if the issue is solved with the less amount of money spent.
I suggested the shop because:
"I built a new pc but it wouldn't post, just the motherboard light (I think this is an audio light) and case fan turned on for only 2 seconds then died. I tried another PSU and the same thing happened"
Although it looked like a power issue, the fact that he tested 2 PSUs with the same result conducted to the idea that the issue might be related to the motherboard.
Hard to troubleshoot without swapping parts, and I never recommend buying parts without making sure/knowing what the culprit is.
Sometimes, testing the components at a local shop is cheaper than buying parts that you later realise they didn't solve the issue.
As a prove, check your last suggestion:
"...then its that hardware if it still dont work i would think yoor board may be doa".
What if he RMA-ed the board and waited for weeks just to find out that the problem still remains? Money and time lost.
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