TS 464C2 won't boot after memory upgrade

At first, I thought the original RAM was incompatible. Then I chose RAM with the same specs and brand, but still couldn’t fill all the slots and boot up.

可以請您協助拍照記憶體插槽插的情形,並提供您記憶體的詳細品牌及型號嗎?感謝!

KLEVV DDR4 SO-DIMM 1x8GB Value Series 3200MHz CL22