The missing of MH370, boeing 777 might be the first case in the aviation history where the fly by wire (FBW) and FADEC (Full Authority digital Engine control ) have failed. This can happen in the case of a total electric failure, which is an extremely rare possibility in such a modern aircraft, but it is not IMPOSSIBLE (even a fire which got contained eventually can cause it). Boeing 777 has actual cables to some of the spoilers (roll control) and the stabilizer trim (pitch control). I don't believe there is any rudder or elevator in the event of total FBW failure on a 777. Also boeing 777 uses FADEC, for engine control. So with a total electric failure using differential thrust is also out of the window. Hence if the aircraft continued its flight upto 0810 in some unknown direction as suggested by the last pings received by inmarsat satellites,the pilot must be commended for his tremendous effort for continuing the flight in the vastness of ocean unable to control the aircraft in any desired flight path, rather than being suspected for hijacking his own flight. The manufacturers must rethink the design considerations taking into account the importance of a revision to manual control, using cables which will come to help in the rarest of rare event of FBW failure.
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from the article: What really happened to MH370? The top three theories