This may be reaching a bit but I've recently had a couple of people who jailbroke their Kindles complain about a similar problem where they had installed USB networking and then forgotten to turn it off. Though this would not affect your Fire tablet though the Fire might require you to enable USB for file transfers. Not sure how this is done on a Fire tablet but likely a notification that needs to have you change the connection from USB charging.
Do any of these devices work on another computer with a different USB cable? At times, I've had to try multiple USB cables to find one that works.
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