This is a coincidence in that I just got my PC back. I had a problem in that it will not shut down. Every time it closes it automatically re-opens. The diagnosis is that the mother board if has a problem. which is not worth fixing. But tue coincidence:- the key board and the mouse would not work, not recognised when I re connected them. I just bought a new keyboard and now the mouse and the keyboard are fine. Of course the PC still does not shut down !