A control apparatus includes a first control unit, a second control unit including a memory for storing information for performing startup processing, and a power supply unit configured to supply electric power to the first control unit and the second control unit, and in a case where electric power is supplied from the power supply unit to the second control unit, whether a startup state of the second control unit is normal is determined. In a case where the startup state of the second control unit is determined to be normal, the power supply unit supplies electric power to the first control unit. In a case where the startup state of the second control unit is determined to be not normal, to power supply to the memory from a backup power supply for the memory is stopped so as to clear the memory of the second control unit.