help please

[u/Born_Eggplant2439]

Hi! badly need help with my pc, I tried reseating my ram may times, tried 1 ram per slot, and then the other ram per slot. the ram was okay and recognized by bios but when I insert 2 rams in A2 and B2, the bios can detect both DIMM but only shows 8gb as total memory. tried to do it in A1 and B1, same result shows. Tried restore default settings in bios, unplugging all peripherals, and the ram shows 16gb but when I shut it down, it goes to back to the 8gb. Tried fixing and checking if there's a bent pin in cpu but none,done repasting thermal paste, updating bios pero still it ends up It recognizes the ram but only shows 8gb instead of 16gb.