...or, it could be that the battery is dead and needs to be recharged. The unit will not run directly off the charger without the battery installed. put the battery in, plug the charger in and wait. no need to panic or to wildly speculate that Diablo "bricked your device". Thus far, your description sounds exactly like what has always happened with the N800's when the battery is exhausted; this is not new behaviour introduced by an OS update.