It reset to factory fine though oddly it remembered who I was etc. I can reload all the books I bought from Amazon (one by one). I still can't move any books from my library to the Kindle using Calibre though
Could it be the USB cable? It does charge fine over the cable and I can access the Kindle via explorer so I'll admit this seems unlikely. Can I side load my collection using email (I've never tried this and I'm a bit unsure whether this is only for Amazon books)?