Patent ID: 8340545

Claim:
An image forming apparatus provided with an operation unit for forming an image, comprising: a power source unit adapted to supply electric power supplied from an external power source to the operation unit; a storing unit adapted to store successful data, showing that the image forming apparatus has powered on successfully, in a case where the electric power supplied from the external power source to the operation unit is not less than a predetermined threshold value during a time period between a timing of the image forming apparatus having powered on and a timing of said power source unit supplying regular electric power to the operation unit; a mode selection unit adapted to select a first mode in which the regular electric power is supplied to the operation unit at a start-up in a case where the storing unit stores the successful data, and select a second mode in which electric power smaller than the regular electric power is supplied to the operation unit at the start-up in a case where the storing unit does not store the successful data; and a power control unit adapted to control the electric power supplied from said power source unit to the operation unit according to the mode selected by said mode selection unit.