Agreed--if the battery is very low or damaged, it will boot for a moment and then immediately power-off to protect the battery.

If you HAVE plugged it in and left it charging for a few hours and it's STILL doing this, it could be that something corrupted the apps/data and ruined the boot process/drivers/etc. In that case, you will want to re-flash the N810 to get it back to a sane state.