The invention provides an image-forming apparatus and a method for controlling the same. The image-forming apparatus includes a power-source part, a fixing device, a power-source switch, a memory part, a fixing motor, and a drive-transmitting part. The power-source part generates and supplies voltage. The fixing device includes a rotating heating body, a heater, and a rotating pressing body. The power-source switch turns off a power source of the image-forming apparatus. The memory part stores recorded data that the power source was turned off due to the operation of the power-source switch. When the recorded data is stored in the memory part, electric power is applied to the fixing motor so as to initiate rotation at a first torque, and when the recorded data is not stored, electric power is applied to the fixing motor so as to initiate rotation at a second torque, which is less than the first torque. The drive-transmitting part transmits the driving force of the fixing motor so as to rotate the rotating heating body and the rotating pressing body. According to the image-forming apparatus of the invention, when welding occurs to the fixing device, fault positions are not further increased.