What about fly by wire aircraft? Is the computer system nullifying the pilot commands?
All modern aircraft (except light civilian craft like a Piper Cub, etc.) are “fly by wire” in that the aviator only makes his suggestion to the avionics system and the aircraft makes the requisite adjustments to the control surfaces and throttle. If the incoming data is telling the computer to do something but the pilot disagrees with it, the pilot is supposed to be able to override but there are exceptions. If push comes to shove, the aircrew are given the option to disconnect the automated system.
The computer systems often get bad inputs from faulty or stuck sensors. If the AoA sensor erroneously says the craft is nose-up and stall is imminent, the control system pushes nose down. This isn’t limited to Boeing aircraft, either.