Hi! I have a big problem with my DIMM 1. My computer is Dell Precision T5500. Motherboard: Dell 0CRH6C. RAM configuration: 6x2gb (DIMM1-6) and 3x4gb (RDiMM 1-3) 
My problem has started after change a thermo paste and unhook a loot of power cables in my computer. After this i have a message in start my computer. This message give me info about problem with DIMM1 and adding: System memory has been changed. So... I don't have 24gb ram but I have 16gb ram. I try change frame cubes but it's not working. Any suggestions? If u wanna it, my other specs is:
2x Intel Xeon X5687 
Palit GTX 970 
128gb SSD
500GB HDD
1TB HDD