Image forming apparatus

An image forming apparatus that is replenished with toner by using a toner container that is detachable from an apparatus body and a toner conveying motor that conveys the toner from the toner container, the toner container comprising a storage memory provided with an electric connection terminal and at least one positioning boss, the image forming apparatus comprising:

• an image forming component having a toner concentration sensor that detects toner solidification in the toner container;
• a display control component having a function of causing a display section of the image forming apparatus to display a printing operation display including at least one printing process to be performed;
• and
• an operation determination component that determines whether a user has performed the operation of shaking the toner container as instructed by a first message display,
• wherein when (a1) attachment of the toner container to the apparatus body is detected and (a2) the toner solidification is detected by a value of drive torque of the toner conveying motor, the display control component causes the display section to switch from the printing operation display to the first message display that gives illustrated instructions in an operation of shaking the attached toner container with a confirmation button,
• when the first message display is displayed, operation of the at least one printing process is disabled, and
• when (b1) the confirmation button is operated and (b2) reattachment of the toner container is detected by the electric connection terminal, the operation determination component determines that the user has performed the operation of shaking the toner container as instructed by the first message display, and
• the storage memory stores a residual amount of the toner.