Precision 3570 RAM upgrade

I have Dell "Precision 3570" with samsung 2 x 8 GB DDR5 RAM, I replaced the RAM with 2 x 16 GB Crucial DDR5 but the machine does not boot, I followed the instructions carefully and unplugged  the battery before replacing it but still, not booting (nothing on screen at all).

Both the old working RAM and the new are DDR5-4800

I updated the BIOS, but still have the same problem.

I also tried it on my colleague's machine "Precision 3581" but got the same result (black screen).

We also replaced the RAMs with new one (had several new chips) in case the one I'm using is damaged, but got the same result.

Any suggestions?