Just bought a new imac. I've been using it for a week. This morning it would not turn on. I checked all the leads but they were ok. I turned it all off from the wall and tried again... nothing. That little button on the back of the imac did nothing. I thought ok blown fuse. I decided once more but this time I turned on my keyboard and trackpad first by pressing their connect buttons. I then tried the imac and it turned on. Faulty hardware ?