Recent rumors say that the laptop ban might be extended to flights originating in Europe heading for the USA. This made me think, if laptops are not safe for carriage in the cabin how can they be safe for carriage in the belly of the aircraft? Say that a notebook is short wired such that if it turns on it ignites the battery. Storing the laptop in your carry on luggage would result in a cabin fire which can be put out by the cabin crew. But if this same laptop is in a checked-in bag there is no cabin crew near it. How is this risk mitigated? Or what are the procedures in case of a belly fire?
Furthermore if a laptop is carried inside a carry-on bag it can be switched-on at the security checkpoint to verify that it is a working laptop.