Patent ID: 8063647

Claim:
A testing apparatus comprising: a relay comprising: a coil; a first single-pole double-throw (SPDT) switch comprising a grounded first contact and a second contact; and a second SPDT switch comprising a first contact connected to a power source and a second contact; and a connector comprising: a first hard disk drive (HDD) indicator pin connected to the power source; a second HDD indicator pin connected to the second contact of the first SPDT switch and the second contact of the second SPDT switch; a first switch pin connected to the power source; and a second switch pin grounded via the coil; wherein in testing, the connector is electrically connected to an indicator connector of a host computer to be tested; upon the condition that a power switch of the host computer is closed, the second switch pin receives a high level signal, a current passes through the coil, the first contact and the second contact of the first SPDT switch are connected, the second HDD indicator pin receives a low level signal, an HDD indicator of the host computer lights up; upon the condition that the power switch is opened, the second switch pin receives a low level signal, no current passes through the coil, the first contact and the second contact of the second SPDT switch are connected, the second HDD indicator pin receives a high level signal, the HDD indicator does not light.