Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
There is a limit not just on 'how much' of the type of RAM memory that can obviously fit into the slots on the board.... but also, of what speed and type the memory is.
I will look up specs on that mother board (if I can identify it from the data you have given), but also please tell me what type, and speed, of memory you tried to fit 16 GB of, into this mother board. And I will advise you as to how to proceed and more or less what is going on.
Any other numbers or names on the mother board might help, please provide them, but only the really prominent ones.
(I am guessing this is a 'clone' or 'no-name' or self-assembled PC we are working with, correct? as opposed to a Dell, HP, Compaq, Gateway, etc.)
OK... I will now look up specs on that board, see what is indicated about the memory you tried and failed with, etc.
Expect this to take from 10 minutes to (probably) an hour or even overnight, doubtfully - unless you definitely need the advice sooner.