When Did The Power Go Out?

The common belief is that the power went out a minute or so before the ship broke in two. However, Thomas Ranger stated that when she broke, the power in the bow failed but remained on in the stern until the stern sank. Joshua Noble, a Titanic expert, believes this because it comes from a survivor who was there. However, Roy Mengot, also a Titanic expert, says the power would go out when she split because when the ship split, it would cut the steam to the dynamos. Obviously, there is a ton of debate about when the power went out. Honestly, you can pick whatever one you want. They are all acceptable at this point, since we don't know for sure.