BIOS cannot detect RAM on 2nd slot but CPU-Z does

[rakrak12]

Hi everyone,

So, I had problem on my RAM. The problem is, my laptop cannot detect my RAM on 2nd slot, but when I check CPU-Z, it shows all of my RAMs. Of course, it makes my OS, Windows 11 23H2, just detect RAM on the 1st slot. Some thread said it because the AMD processor. The other said it was the pin. I have already tried:
- swap for each RAM slots and RAM pieces,
- checking with memory diagnostic,
- resetting BIOS
- upgrading Windows 11 version to 23H2 (before was 22H2)
- cleaning 2nd slot from dust,
- Trying RAM slot and piece combination, every piece of my RAMs just works well, the problem is on 2nd slot. My laptop won't boot if just 1 piece of RAM on the 2nd slot.

Do you guys have any idea what the cause is? 

Here is my laptop specification:
HP Pavilion Gaming Laptop 15-ec2047ax
- AMD Ryzen 5 5600H
- 8 GB RAM (This should be 16 GB) DDR4 3200Mhz. Every piece of my RAM is in original condition (same manufacture, frequency, etc. you can see more detailed information below)
- 512 GB SSD Nvme by Samsung
- Nvidia GTX 1650
- BIOS version F.25 from American Megatrends Inc. (This is the last version of BIOS for my laptop model)
- Windows 11 23H2

Memory information from CPU-Z:

Task Manager (or Windows) just recognize from 1st slot

[Jonathan_B_B]

I am having the same issue with my HP Pavilion Gaming Laptop 15z-ec200 equipped with an AMD Ryzen 5 5600H. A couple years ago I installed Crucial 2x8GB DDR4-3200 SODIMM RAM (compatibility verified), and everything went well with all 16 gigs detected. However, while checking task manager a few months ago I noticed that only 8 gigs were shown and "1 of 2 slots". Same results in the BIOS, but CPU-Z shows all 16 gigs. Since then, I've tried:

• Ensuring "Maximum memory" is unchecked under Advanced Options in System Config (it was previously checked and set to 0)
• Resetting the CMOS
• Reset BIOS settings to default
• Updated to latest BIOS version
• Updated to latest version of Windows 10
• Ran Extensive Memory & CPU tests through UEFI (passed everything)
• Swapping the RAM channels (both sticks work when in slot 1)
• Inspected DIMM slots for visible damage or debris (nothing I could see with the naked eye)

All to no avail. I am 99% sure that the RAM itself is not the culprit, yet there has been no distinct event which could've reasonably caused motherboard damage. The CPU is soldered on so I don't think I can reseat it or anything. This laptop is only ~2 years old. My warranty has expired, a replacement board is 300+ dollars, trying solder on a new DIMM slot is too risky, and even buying a single 16 gig stick wouldn't match up to 2x8 dual channel performance. Are there any potential solutions we've missed, or alternative workarounds?

Info from CPU-Z: