You have CL=19 now, but with 2666 MHz RAM. You would not be able to use CL=19 with 3200 MHz RAM (and probably not CL=20 with 3200 MHz RAM). All things being equal, timing must increase with faster RAM. Kingston Fury is performance RAM, for gaming systems and overclocking situations. It is unlikely to work in your Precision laptop. The Crucial RAM I specified should work for you. Perhaps you did not seat the RAM well. Or, if you didn't take ESD precautions as I indicated (repeatedly touching a metal case part is not sufficient mitigation) you could have caused a fault.
Helo to all. I do have 2x16GB RAM SODIMM 2666Mhz CL19 (Hynix SODIMM DDR4 2666MHz 16GB CL19 HMA82GS6JJR8N-VK). Works good. My friend gave me double of these: 2x32GB RAM SODIMM 3200Mhz CL20 (Kingston FURY SO-DIMM 64GB KIT DDR4 3200MHz CL20 Impact). Change to 3200 Mhz shouldn't be a problem, because of Intel(R) Core(TM) i7-9850H CPU @ 2.60GHz which supports 3200Mhz.... But I awared of timing. Should be only CL19 be implemented?? Is Kingston on "Whitelist" or not? If these are not suitable, which couple of 2x32GB would you recommend??  Thanks a lot Jan
RAM extension of Dell Precision 7540