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First six character of your Kindles serial number please.
Did it ever mount?
Did you receive it new or used?
If you have had it since it was new, and also the cable, that is a long time, use a known good cable.
Is it jailbroken?
What packages have you added to it?
Is the USB port on you are trying to use USB-3?
Try again with a known good cable and a USB-2 port.
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