According to Amazon, try:
Kindle not recognized when connected to computer with USB
Try a different USB port. If this doesn't work:
1.From Home, select Menu, select Settings.
2.Select Menu (again), then Restart.
3.Connect your Kindle to your computer via USB, and restart your computer.
Please contact us if you continue to experience problems.
I've also read some stuff about high speed USB ports maybe having problems, but my K3 works fine on most things, but I haven't tried USB3.
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