Dual channel RAM on MOBO not working anymore

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yamas85

yamas85

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Mar 23, 2015
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Hi

Today I changed my Corsair H110 with the Noctua NH-D15 cpu cooler.
But after, when I tried to turn my computer on with all 4 RAM sticks, it would keep rebooting itself after just a few seconds. Nothing comes up on the screen. Debug code on MOBO is 03 ('Power on North Bridge Initialization')

My computer will accept RAM sticks in DIMM channel 1+2 (the single channels). So it seems the dual channel function is problem here. Anyone knows anything about fixing this problem?

(I tried switching the coolers again, but it seems like the 'damage' can't be undone)

My system if that is needed:
CPU: Intel Core i5-4690K
CPU Cooler: Noctua NH-D15 / Corsair H110
Thermal Compound: Noctua NT-H1
Motherboard: MSI Z97-GAMING 7 ATX LGA1150 Motherboard
Memory: Kingston Savage 16GB (4 x 4GB) DDR3-1600 Memory
Storage: Samsung 850 EVO 250GB WD Caviar Blue 1TB
Video Card: MSI GeForce GTX 970 4GB Twin Frozr V
Case: Fractal Design Define R5 (Black)
Power Supply: EVGA 750W 80+ Gold Certified
Case Fan: 3x Noctua NF-A14 PWM 82.5 CFM 140mm Fan
Monitor: BenQ XL2430T 144Hz 24.0"


Thanks
 
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Joshua Martin

Joshua Martin

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Sep 16, 2014
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I'm pretty much having this same issue with my "b channel" of RAM slots after changing cases. My PC woin't boot at all with RAM in slots 2&4. Guess it's going to be RMA for me.

Is it possible for the CPU pins to bend even if the CPU or cooler hasn't been removed? Or for it to not be making a good connection, but enough to still run the PC and slots 1&3 work? I just don't understand what I did to cause the B channel to stop working. I was properly grounded and I always work on my PC with the PSU plugged in to the outlet (power off of course). I didn't remove the RAM or CPU cooler/CPU when changing the MOBO to the other case. Just don't get it :/
 
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yamas85

yamas85

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Mar 23, 2015
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I have now checked.
No missing, no damaged or bent pins. Not any debris what I can see of. Ramm and videocard is seated properly.
 
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yamas85

yamas85

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Mar 23, 2015
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Tried that just now, but with no luck.

Today the last Debug Code before rebooting was '55', 'Early Memory Initialization'. Dont know if I changed something in the BIOS. Yesterday it was debug code '03' - 'Power on North Bridge Initialization' it showed before rebooting.
 
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F

Faiz Aslam

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May 3, 2015
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its happened to.me today. im with sample specs like u. im ended here for serching solution. but i fixed my own or its just luck i dont know.
so here what i did...
removed both 4x2 ram then then start pc and then turn it off again then put back 1 RAM in second slot which is second from the side of cpu ( i dont know how people number it :p) then turn it on again and its work... then turn off again.and put the second RAM in 4th slot and BOOM working :)
 
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