... There was not this ridiculous problem, already mentioned in another post, power cable, which if not plugged correctly somehow (problem: neither completely plugged, neither " not enough ") prevents the display of the screen. What are the comments if the firm does nothing to solve this annoying default. When properly plugged - but you really "play" with the cable, no problem everything works. So, for me, which I withdraw 5 stars 2 stars because of this defect.
