My issues has been the dancing squares locked up.
Nothing worked after this. Paperclip reset, home button reset. Nothing.
What I found 'works' is: bring up the Kobo desktop. Plug in the usb. For some reason, the squares start dancing again, sometimes.
You may have to sync the desktop to get the squaresto dance.
And by 'works' I mean that the squares are dancing again. For 7 1/2 hours so far...