My BB Bold 9900 just stopped working today, no recent software updates or app downloads, no trauma to it. This morning it greeted me with a blank screen and the LED alert flashing: blink, pause, 3 blinks. I took both the battery and SIM card out and reinserted them a minute later: no change. Also, put a friend's fully charged battery in my phone: no change. Is my phone kaput? What's going on?