...unless I do a battery pull. Then, when I shut down and try again, nothing. Another battery pull, and it works. Just to be clear, I'm holding down the power button and volume down rocker. I know I'm doing it right because it works after the battery pull! I just rooted the phone today, but it was acting this way before the root (actually I hoped the root would fix it!). I can't find any other Thunderbolt users with this problem.