An electronic device (1), which can assume an operating state and at least one energy-saving state, with a power supply (7) that can be connected to a mains voltage, and an evaluation unit (4), which can control the electronic device (1) from the operating state into the energy-saving state and vice versa, wherein the evaluation unit (4) is connected to the power supply (7) in such a way that the power supply (7) can be turned off by the evaluation unit (4) for assuming the energy-saving state and can be turned on again for assuming the operating state, and the evaluation unit (4) can be supplied, at least in the turned-off state of the power supply (7), with energy from another electronic device, which is connected via a standard interface to the electronic device, and/or with energy from a capacitor and/or with energy from an accumulator and/or with energy from a solar cell. The invention also relates to the method for controlling the electronic device in at least one energy-saving state and also to a computer and also to an arrangement made from a computer and the electronic device.