The "checkerboard" pattern indicates that the firmware failed to initialise. The most common cause is a corrupt filesystem, which is nothing to worry about - you've probably disconnected the Gen3 from your PC without doing a "Safely Remove Hardware", I'd guess; this can easily result in filesystem corruption.
You should still be able to connect your Gen3 to your PC and see it in Windows Explorer. Reformat the disk (the one called "Gen3") and, if you're using a modern version of the firmware, that should fix the problem.
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