After updating my firmware, my phone rebooted. After it rebooted, my screen was black. It was on, but nothing would show on the screen beyond the top bar. Frustrated I turned off my phone, and since then it's been unable to move beyond the "Samsung". I've been at it for over an hour to no avail. It was fully charged before the update, and was charging throughout. I have tried many different things in order to get it to start, but nothing has worked. I have had no problems leading up to this update. Any suggestions? (Also, this was not a virus, because all of my other Android-using friends have gotten it...and many have faced a number of problems as well.) --Samsung Galaxy S3 user