Hmm, my N810 died after my second reboot (I had installed rtcom, but I don't think it got to the stage where that should matter).

Basically I was seeing the white screen and blue Nokia symbol, and it just sat there, and eventually the backlight went off and the screen faded away. Tried a few times, no change, flashed back to Chinook (and thinking about doing it all again

Hmm, perhaps this should be in the bug thread?