DIMM3-4 is evil

[SuneFyr]

My old Z77MA-G45 began not to boot up, I tried (clear CMOS, remove OC, Remove some RAM,) screen does not turn on.

So I bought a new motherboard (GA-H77M-D3H) and now it’s just in boot loop, screen does not turn on.

Send it back and get a new one. Now same thing happens again

I now try to remove everything I can just to get to BIOS/UEFI. (I did the same with the other motherboard to btw) now BOOM am in BIOS/UEFI. At this point am so lost, like “WTF”. So I test a lot, and  find out that it will not start if I have RAM in DIMM3 or DIMM4

 

So my question is, what can it be? CPU, motherboard? At this point i am lost. (can it be some pin on the CPU socket that is not connected )

 

DIMM 1&3 Channel A

DIMM 2&4 Channel B

[NeverNotExhausted]

Have you tried booting with only one dimm at a time to see if it's actually your memory that has died?

[SuneFyr]

Have you tried booting with only one dimm at a time to see if it's actually your memory that has died?

Yes i have 8 RAM 3x4GB and 5x2GB (1333MHz)all of them works as long i don't put them in DIMMS 3-4

[NeverNotExhausted]

Yes i have 8 RAM 3x4GB and 5x2GB (1333MHz)all of them works as long i don't put them in DIMMS 3-4

 

That is super strange So not even dual channel in slots 1-3/2-4 at the same time or just one dimm at a time?

[SuneFyr]

That is super strange So not even dual channel in slots 1-3/2-4 at the same time or just one dimm at a time?

I can use dimm 1 and 2. but if i put a ram in 3 or 4 then it just dont boot (I've tried with a dual-channel kit)

 

@SuneFyr

3 & 4? Then it'd be a faulty channel (don't mistake with combination for dual channel) and you said you tried different mbs and sticks so it'd be a faulty imc

Ok but on H77 (with 3770K) is Integrated memory controller not on the CPU ?

[SuneFyr]

Yup, it's in the cpu.

Try the next thing:

2 GiB sticks in 1&2 + 4GiB in slot 3

Also try the same with the 4 GiB in slot 4 instead of 3

I had the same idea when I tested, so I tried. and no luck.