CPU blown or motherboard DOA?

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ExWunderkind

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Feb 11, 2014
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I have been having some problems recently and my motherboard blew, I ordered a replacement today but could not get the system to boot.

I have a speaker fitted to the motherboard but it will not POST, I have stripped everything down and breadboarded with just the CPU fitted looking for the no memory beeps but nothing. I can get all the chassis fans and HSF to spin, even the GPU fans spin when it is fitted, but no POST beeps.

I have worked my way systematically through the stickier thread too.

I'm beginning to think the motherboard took the CPU with it when it went. Either that or the motherboard is DOA.

Is there any way I can test for this?
 
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ExWunderkind

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Feb 11, 2014
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Sorry should have posted these, but been working on this for 3 hours now...haha

Anyway:

CPU: AMD FX-8320
Motherboard: Gigabyte 990fxa-ud3 (Rev 4.0)
Memory: Avexir Core Series 1600Mhz (2 x4GB)
GPU: Gigabyte R9 290 WF3
PSU: EVGA SuperNOVA 750w Gold

Should also add that whilst I have stripped it down for breadboarding I have tried a different PSU and still no POST beeps.
 
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ExWunderkind

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Feb 11, 2014
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I'm really thinking the CPU got blown when the motherboard fried. Think I'm going to order a new CPU now.

Considering it's the motherboard that did this, I might see if I can get Amazon to cover the cost of this.
 
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ExWunderkind

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Feb 11, 2014
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You keep mentioning my PSU, but I have not mentioned that is the problem. Other than to say that I eliminated it from my investigation.

When I removed the motherboard, when it was turned over you could see where the solder was scorched and the circuitry had burnt away.

I have a feeling Amazon may well not help me, but it's worth asking anyway, even if they just help towards the cost. We'll see anyway.
 
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ExWunderkind

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Feb 11, 2014
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Yes I have an aftermarket CPU cooler and installed the standoffs for that. Before the motherboard fried my PC was working for 5 months. I had been having some random FPS drop issues, and I believe that the motherboard was the cause of this now and then ultimately fried.

I had been monitoring my temps inside the machine before this happened and both GPU and CPU were well within normal operating temps, even under heavy load.

Do you think I could return the CPU as faulty to the original vendor? I mean I'm only guessing the CPU was taken out by the motherboard, but is it possible it happened the other way around?
 
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ExWunderkind

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Feb 11, 2014
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This motherboard wasn't the one that originally broke. The one that fried was an ASRock 990fx Extreme 3. I changed to the Gigabyte because of the compatibility issues with the CPU. When I bought the CPU and motherboard it was listed as compatible, and then silently removed, then it was re-added with an addendum that a top down CPU fan must be installed, by this point I was using a Hyper Master Evo 212, which is not top down. So Amazon were pretty good to offer me a straight out full refund for a 5 month old motherboard, and I can't fault them there.

Yeah I thought it was unlikely for a CPU to go.

Before the motherboard fried my CPU was 45 degrees under load and GPU was 71. And no I was not over clocking at this point in time, which is another nice bonus of the new motherboard being very nice for this.
 
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tiny voices

tiny voices

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Sep 6, 2012
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The Cooler master Hyper 212 EVo is BETTER than a top down cooler. Those are the stock junk coolers.

The mean something to cool the VRMs, which your new board has, making it better for overclocking. I like it alot and it overclocks very well.

I highly doubt anything is wrong with your CPU. If your computer is working now like you said a few posts ago, I would not worry about anything.

 
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ExWunderkind

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Feb 11, 2014
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Sorry my PC isn't working yet. This was what I was worried about. After swapping everything out, it can only be the CPU that has gone as well as the motherboard, or the new motherboard that was delivered this morning is DOA.

I've now ordered a new CPU but am worried that if I install this new CPU, it will turn out the motherboard was DOA.

Argh.
 
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