PC(s) wont post

I am in the final stages of building two PCs, but upon testing, neither post.

When tued on, fans spin, lights flash but no bios screen and motherboard error related to memory.

PC 1 - Gives error 53 PC 2 - Gives error 19

What we have tried so far:

1. Removing all compunents except MOBO, CPU and PSU
2. Inserting one RAM stick, tried each slot
3. Clearing CMOS (Button press and Jumper)
4. Updated BIOS (PC1)

Any Ideas?

See build below: PC 1 MOBO - Asus X99M WS CPU - Xeon E5-2697 V4 RAM - Kingston 64GB PC4-2133 CL15 288-Pin RDIMM Kit (4x16GB) GPU - Quadro M4000 SSD - Samsung 850 Pro PSU - EVGA Supeova 650W Gold Case - Silverstone TJ08-E

PC 2 Mobo - Asrock Fatality X99M Killer CPU - Xeon E5-2697 V4 RAM - Kingston 64GB PC4-2133 CL15 288-Pin RDIMM Kit (4x16GB) GPU - Quadro M4000 SSD - Samsung 850 Pro PSU - EVGA Supeova 650W Gold Case - Silverstone TJ08-E