Patent ID: 8719558

Claim:
A distinguishing circuit comprising: first to fifth resistors; a front panel connector comprising first to tenth pins, wherein the first pin is connected to a power supply of a computer system through the first resistor, the second pin is connected to a first light emitting diode the third pin is connected to a hard disk drive light, the fourth pin is connected to a second light emitting diode, the fifth pin is grounded, the sixth pin is connected to the power supply through the second resistor, the sixth pin is further connected to a power button, the seventh pin is connected to the power supply through the third resistor, the eighth pin is connected to the power supply through the fourth resistor, the eighth pin is further connected to a BIOS (Basic Input Output System) chip of the computer system, the ninth pin is connected to the power supply through the fifth resistor, the ninth pin is further connected to the BIOS chip, the tenth pin is grounded; and a jumper, wherein when the ninth pin is connected to the tenth pin through the jumper, the BIOS chip determines that the computer system is a first type; when the eighth pin is connected to the tenth pin through the jump, the BIOS chip determines that the computer system is a second type.