My kindle fire seems to be frozen.can't shut off, or change page?
It had trouble processing a purchase in the book store last night and doesn't work at all now
You Sir or Madam are a comedy wizard!
"My Kindle Fire is frozen"
There're quite a lot of users having similar problems (screen freeze, kindle not responding, etc). There's an excellent article done by an actual user, I've put it in my previous answer below:
Please check and see if it helps.