i have bought additional set or rams which are different of which i have in terms of the body , but identical in the specification , but when i put every thing together i got nothing on my screen but when i plug only either the new or the old ram individually display works again !!
old ram
CMU16GX4M2C3000C15R
new ram
CMK16GX4M2B3000C15
old ram
CMU16GX4M2C3000C15R
new ram
CMK16GX4M2B3000C15