Help - my BlackBerry was working fine and all of a sudden went black. When I pull the battery the restart bar on the screen goes half way and stops. I've tried using app loader but it says I have a fatal error. My BB was new in November (9900) and I love it but it's taken me all day and I'm still nowhere in fixing it. Desktop manager also doesn't help - it will not connect then connects and when I ask for a repair says there are no software updates available.