Maemo mythology might lead one to try putting the device in a fridge or a freezer for a while to see if it will charge afterwards. This seems to have helped with previous N8x0 devices, apparently. Searching the forum for "freezer" will give results.

Don't blame me if you try it and get undesirable results. Take whatever precautions are necessary to prevent moisture ingress. Do not shine laser in remaining eye. I take no responsibility for any ramifications, and have never tried this with any of my devices.