I took my phone out of my pocket on Saturday and not a single one of the keys worked. The keypad, trackball, side keys, etc. all aren't responding. I haven't dropped it or gotten it wet or anything. If I plug it in to my computer I can see the screen light up and see that I have full battery, yet none of the keys work to select anything. I have tried taking the battery out and rebooting it more times than I can even count. Nothing so far has worked. Any ideas? I don't want to have to get a new phone yet!