Yeah, full memory will show, but if theres a problem , it'll cause errors. If you have two RAM chips, simply remove one by pulling the white clip up on it, and pull it out carefully.
If the one in then has issues, take that one out, and put the other back using a reverse process. You should hear a click and the button will slot into a hole made in the RAM chip so you know its in.
By the Way, don't create more than 1 thread for the same questions. Thanks