Image forming apparatus

An image forming apparatus comprising a plurality of devices driven by power and configured to be operated in:

• 1) a standby mode in which the image forming apparatus stands by a start of an image formation;
• or
• 2) a power saving mode in which power supply to a part of the plurality of devices is stopped so that the power consumption of the image forming apparatus in the power saving mode is reduced compared with that of the image forming apparatus in the standby mode, comprising:
• a door which is opened when consumable material is replenished;
• a detection unit configured to detect whether or not a replenishment of the consumable material is required;
• a door opened/closed detection unit configured to detect the door opening or door closing when the image forming apparatus is in either the standby mode or the power saving mode;
• a display unit configured to display information;
• and
• a control unit configured to display a guide to replenish the consumable material on the display unit when the door opening is detected by the door opening/closing detection unit in the power saving mode and it is detected by the detection unit that the replenishment of the consumable material is required.