Patent ID: 8319438

Claim:
A circuit for detecting computer states, the circuit comprising: a first light emitting diode (LED) comprising an anode connected to a first power supply, and a cathode; a first electronic switch comprising a first terminal connected to the cathode of the first LED and also connected to the first power supply via a first resistor, a second terminal connected to a hibernation state pin of a motherboard slot of the computer, and a third terminal; a second electronic switch comprising a first terminal connected to the third terminal of the first electronic switch, a second terminal, and a third terminal grounded; and a third electronic switch comprising a first terminal connected to the second terminal of the second electronic switch and also connected to the first power supply via a second resistor, a second terminal connected to a power saving state pin of the motherboard slot of the computer, and a third terminal grounded; wherein when the computer is in a power saving state, the power saving pin is at low level, and the hibernation state pin is at high level, the third electronic switch is turned off, the first and second electronic switches are turned on, the first LED is turned on and emits light.