Answer to "How can I turn off or unfreeze my kindlke fire?"My Paperwhite won’t charge or turn on. Sad.
Answer to "Trouble inserting new fan due to old metal part"I would mount the new fan in the original metal part. If you can't get the screws to line up you could use really good glue to hold it. The Dollar Tree has really good contact cement if you live near one. As long as the fan can spin freely and it's near the original location you should be fine.