Post attempt failure on GA-Z97-UD5H-BK, unclear on cause

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Rworwin

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Oct 2, 2014
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Not sure exactly where this goes, since there are several different potential causes.

I'm doing a post test for a rebuild (after a previous system failure in which the PSU seemed to fry something on the mother board). I'm using the same GPU, memory, and processor, so these are all potential failure points. I've examined each one thoroughly and cannot find any physical damage to the components.

Here's the current build.

Motherboard: Gigabyte Black Edition LGA 1150 Intel Z97
CPU: Intel Core i7-4790K
Memory: G.SKILL Ripjaws X Series 32gb (2 separate 2x8gb sets bought about 5 months apart)
GPU: EVGA GeForce GTX 770 Superclocked 4 GB GDDR5
PSU: EVGA SuperNOVA 1050 GS

First off, the ram slots are numbered like so:

4 2 3 1

My first attempt with all 4 ram cards installed yielded a CO LED debug code and repeated short beeping from the speaker (I counted 20+, so it's definitely not another error code). After doing some research, this apparently means the memory is incorrectly installed. I then attempted installing each card in slot 1, one at a time. Each of these individual tests got me to BIOS with no error codes. Same when each card was installed in slot 3. Installing a single card on slots 2 and 4 yielded the same CO plus continuous beeping error code from earlier.

According to the motherboard, the viable dual module configurations are 1/2 and 3/4. Both of these yielded the error code. Out of curiosity, I tried installing ram in slots 1/3 and did not receive and error code. At this point, I'm thoroughly confused. This is a brand new motherboard, and each of the ram cards appears to be working. Could this potentially be an issue with the CPU? Is there a way I can better diagnose the issue?

Thanks for your time
 
Solution
DeathRabit
Possible issues:
- rams are damaged you can check separately each ram stick with memtest or got to friend and check dual channel on his mobo.
- you have something wrong with mobo go to send to shop RMA
- CPU ram controller is damaged most unlikely try check this CPU on another mobo.

Goodnight I go to hit my bed.
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Hi - Have you read the sticky above?
http://www.tomshardware.com/forum/261145-31-perform-steps-posting-post-boot-video-problems

particular attention to the breadboarding instructions.

 
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Deathrabit, the numbering for the slots isn't sequential. From left to right, it's 4/2/3/1, with 1/2 and 3/4 sharing colors. I double checked the motherboard manual and 1/2 and 3/4 are the dual module configurations. Unless I'm seriously misreading the manual or this motherboard goes against everything I know about ram installation, I don't think that's the problem.

toyftw, I read through that. I'm currently breadboarding (I didn't know that term until now) and trying to diagnose the exact issue. I can boot to bios with ram sticks installed in either or both of the first two slots (numbered 1 and 3, the farthest right two slots on the board), but the second I put a stick in either 4 or 2 (the left two) I start getting the error I described. I've made these tests with different combinations of ram sticks, so I feel like it's not an issue with one or two particular sticks.
 
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I've checked the manual plenty at this point. I know what the two channels are, and either way abiding by specific channels shouldn't be the cause of my problems when installing all 4 memory sticks, which still produces the C0 plus repeated beeping error code.

For the sake of thoroughness, I have pretty much every single conceivable combination of ram sticks and slots at this point. The great constant still remains true. The second I put a RAM stick in either of the left two slots (labeled 2/4) I can no longer post.
 
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Damm I read this wrong for me is 3am 😉

Put paired ram stick to 2 and 1 and try boot.

Is looks that your rams do not want work in dual chancel mode.

Possible issues:
- rams are damaged you can check separately each ram stick with memtest or got to friend and check rams.
- you have something wrong wit mobo go to send to shop RMA
- CPU ram controller is damaged.
 
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Yeah, I've done all of that. Trust me, at this point I've tried just about every combination possible. It's the same result every time. If slots 2/4 (the left two) are empty, it posts. If they have a ram stick, I get an error code and the board shuts off after 10-ish seconds. I've tried making sure the ram sticks are paired as bought, and I've tried mixing them up. All possible combinations lead to the results listed above.

What I'm trying to figure out at this point is if I can somehow diagnose exactly what is causing this issue, especially since the ram sticks themselves all appear to function when in slots 1 or 3. Could this be the CPU causing the problem?
 
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Possible issues:
- rams are damaged you can check separately each ram stick with memtest or got to friend and check dual channel on his mobo.
- you have something wrong with mobo go to send to shop RMA
- CPU ram controller is damaged most unlikely try check this CPU on another mobo.

Goodnight I go to hit my bed.
 
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Solution
After a bit more research, the only other examples of this issue I found concluded that the CPU ram controller was somehow damaged. This seems odd to me, since the CPU operated completely fine with all four sticks of ram for about an week and a half. I guess I'll RMA the CPU and hopefully that solves the problem. I double checked compatibility as well, just to make sure. I'm running the DDR3 1600 variant, 1.50v and this is a fresh motherboard, so bios settings shouldn't be altered.

Thanks, for your help.
 
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