Need to check if it's a dual rank ram. [URL]
I have a T150 that came with 16GB RAM, I purchased 128GB 4x32GB DDR4-3200 PC4-25600 2Rx8 ECC Unbuffered Server Memory from Amazon and I'm able to add two sticks in slots A1&A3 and it's boots up fine and shows 64GB RAM, but when I add the other two sticks to slots A2&A4 the server won't boot, it gets stuck on "Loading BIOS Drivers".  Now I can leave the two sticks in slots A1&A3, then add the original 16GB stick to slot A2 and it works (totaling 80GB RAM).  I tried resetting the BIOS using the jumper but still can't get it to boot when I have 4x32 populated.
T150 RAM issues