Nothing to report except that .... I was about to return the object gasping somewhat, given his refusal to go the expected services ... when my little son suggested I easily return the machine. ..and the miracle is accomplished, there was light Confused but relieved and hilarious, I give you anyway cause my mistake: I believe any honest as holder of a Mac, that while working in an exquisite sobriety, Apple ensures let identify by its sacred symbol : the Apple ... gold, in this case, it could be seen on the reverse side, paradoxically invisible to his fans and not double as I had instinctively installed! Maybe am I or should not I be the only fool in the case !?