Abstract: An example image forming apparatus includes a main board having a processor, a power unit to provide driving power to the main board, a wired interface to connect with an external apparatus through a wired connection, a detection circuit to detect an operation status of the power unit, a display, and a processor. The processor, based on the power unit being detected to be in a non-operating status by the detection circuit in a state wherein a turn-on instruction was input, is to be provided with power from the external apparatus through the wired interface and is booted, and, based on the booting being completed, is to control the display to display a status of the power unit.

Abstract: An image forming apparatus includes an internal memory provided in a microprocessor used to control general operations of the image forming apparatus. As the microprocessor records or reads lifespan information of replaceable elements, which are separably mounted in the image forming apparatus, in or from the internal memory, security with respect to the lifespan information of the replaceable elements is more effectively enhanced, which prevents fraudulent use of the replaceable elements.