ROG Strix X99 RAM issue

[buyoq]

Hi there
Having some kind of issue with my mobo ram
i'm not sure if it's the RAM issue or the RAM slot

PC Specs :

i7 5930k OC'ed to 4.5@1.28v
Asus ROG Strix X99 Gaming (bios 1701 now)
ID-Cooling Frostflow 240L AIO
Intel 600P 256GB nVME SSD
Corsair RM650x PSU
2x1TB WD Green HDD

Ok here we go. i got this mobo less than a year ago and built them using 4x4GB DDR4 Kingston HyperX Fury 2400Mhz. all good until the next 5 months.
Suddenly one day, Windows & Bios just detected 12GB of RAM.i've reseated the RAM, cleanup the RAM contact, nada. still the same
Then i thought maybe the RAM spoilt or something.Asked a friend to try on their pc, to my surprise it works like a charm ! all 4 sticks detected

About a week ago,i bought Kingston HyperX Predator. Again 4x4GB DDR4 2800. Setup XMP profile, all good. works fine running quad channel 16GB 2800Mhz.
Nightmare starts today when i disassemble everything to put them in a new casing. Asus Q-Code went haywire with code d6,53,CC,bd
Once again, i reseated all the rams then only i managed to get into BIOS but now it only detected 12GB running at 2133. If i set XMP profile to 2800Mhz,the pc wont post.Error code bd. i really dont know what's happening here

i even pumped up RAM ChA,ChB voltage to 1.35,1.36. reset bios again. nothing (i even took the liberty to downgrade the bios to version 1504)

Any thought on this guys ?

[Chino]

Try loosening the screws for your heatsink a little.

[buyoq]

Which heatsink is that? The ram or the processor?

[Menthol]

Chino is talking about your CPU cooling block, if they are over tightened, unequally tightened hold down screws can cause the CPU to not seat evenly on the socket pins causing some pins to not make contact with the CPU and the issues you are reporting, evenly tighten the hold down screws/bolts in a cross pastern but don't over tighten them

[buyoq]

thanks Chino, Menthol ! i will try and report back here

[buyoq]

you guys are a GENIUS
reseated my CPU and mildly screw my heatsink, all 16GB detected now !
thanks a bunch !!

[Menthol]

buyoq,
Glad to hear it worked out for you, always good when everything works as intended
Thanks but it's Chino that's the Genius not me