Patent ID: 7386742

Claim:
An information processing apparatus connectable to a bus, the bus being connected to a further apparatus, said information processing apparatus comprising: a detecting circuit operable to detect whether the bus is connected to said information processing apparatus; a control circuit; a first circuit; and a second circuit; said control circuit being operable to control a power supply circuit such that (i) when said information processing apparatus is in a standby mode and said detecting circuit detects that the bus is connected to said information processing apparatus, the power supply circuit provides power to said first circuit and does not provide power to said second circuit, (ii) when said information processing apparatus is in the standby mode and said detecting circuit detects that the bus is not connected to said information processing apparatus, the power supply circuit does not provide power to said first circuit and does not provide power to said second circuit, (iii) when said information processing apparatus is in a power-on mode and said detecting circuit detects that the bus is connected to said information processing apparatus, the power supply circuit provides power to said first circuit and to said second circuit, and (iv) when said information processing apparatus is in the power-on mode and said detecting circuit detects that the bus is not connected to said information processing apparatus, said information processing apparatus returns to the standby mode and the power supply circuit does not provide power to said first circuit and does not provide power to said second circuit.