Hi I am trying to upgrade ram on my dell precision 5820 tower. I got the crucial ram Product Name::64GB DDR4-3200 RDIMM 1.2V CL22. I followed the recommendation for the slot choice but the PC would not turn on and would do two orange lights and then five white lights, which means Invalid memory installed. 

And now when I use the old 8GB stick, the LED indicator turns white and sounds like it is booting but it does not boot up.

The Previous RAM was SkHynix 16GB (2x8GB) DDR4 2666MHz RDIMM ECC of which one is no longer working so have 8GB now.

The CPU is Intel Xeon W-2123 (3.6GHz, 3.9GHz Turbo, 4C, 8.25MB Cache, HT, (120W) ) DDR4-2666)

Am I missing soemthing here? Need help.