From my little understanding, a total loss of power usually means from the engines. There is backup generators that can be used to restart the engines during fl

From my little understanding, a total loss of power usually means from the engines. There is backup generators that can be used to restart the engines during flight, however anything could have happened to stop the engines restarting, but allowed the electronics to remain active. I personally highly doubt terrorism. It's a flight from Rio to Paris, it's not exactly high risk for terrorism, plus no group has claimed the downing (to my knowledge). This means it was a lone psycho, however the chance of getting explosives onto an airline is kind of low. Plus if it was an explosive detonation, the damage would have caused explosive decompression and damage to the air frame. I'm sure the information Air France received would have indicated an explosion, likely as there would have been a complete disconnect between cabin and electricity (engines or backup generator).