faulty ram slot fix
10 cách để tăng tốc một chiếc PC chạy Windows 10
problem with Ram. This is ... How to fix: Use bleach to gently rub the contact leg of the device , then use the soft to clean the ram slot on the mainboard.
How to Fix a RAM Slot that is Not Working (STEPS) - Volt Fixer
Why is my RAM slot not working? Your RAM slot may not be working because of an incompatible RAM, a broken slot, bent pins in the slot, a faulty motherboard
Motherboard's RAM slot possibly not working.
I also suggest you RUN memtest86 for a few hours with 1 stick at a time, just to make entirely sure your RAM is indeed not faulty.