I have precisely the same problem with my N800 (dark vertical bars on nokia boot screen with flickering patterns and wonky icons and fonts on the desktop). It seems to have occurred after forgetting and leaving it on the recharger for 3 or 4 days. I tried cooling it in the fridge for an hour before rebooting to see if it was a thermal effect but the vertical lines, display corruption and flickering still occurred on reboot. This N800 has been a wonderful treasure and I would like to identify the cause and repair it. Is it possible that the problem can be repaired without having to purchase a new display?

Michael\\