A friend of mine has asked me to help him add a graphics card to his computer; an NEC PowerMate with a 900MHz Celeron processor. The problem I am having is that I can't see how to open the case! Can you help? Is there any relevant documentation? I'm afraid I can offer no further details of exactly what model the computer is. It looks like a desktop bok except that it is designed to stand on its edge with feet underneat and it is smaller than the typical desktop box. It looks as though a plastic side would slide off iff the front plastic panel was not blocking it. there is also a slot on the back of the box which could just possibly have some sort of clip inside it?