I bought this second hand, battery won't hold a charge, camera and microphone doesn't work. When I try cleaning it I almost ripped the power on button completely, so I have to manually open up the back and reconnect the cable, it works fine. But then yesterday when I try to connect the cable, at first it was normal (green light fading) but then it refuses to boot up (white light blinking). Backlight works when on greeon but not white, as in this video