A method for performing power management in a data storage system, the method applied to a first electronic device within a plurality of electronic devices of the data storage system, the method comprising: when a first turning on signal transmitted from another electronic device within the plurality of electronic devices is received, utilizing a power management circuit of the first electronic device to provide power to a processing circuit of the first electronic device in response to the trigger of the first turning on signal in order to trigger to turn on the first electronic device, wherein the first electronic device is coupled to the other electronic device; and utilizing the power management circuit of the first electronic device to transmit a second turning on signal to a second electronic device within the plurality of electronic devices through an interface circuit of the first electronic device in order to trigger to turn on the second electronic device, wherein the second electronic device is coupled to the other electronic device through the first electronic device; the method characterized in that the power management circuit receives the first turning on signal through a chassis ground of a connector of the interface circuit; the interface circuit comprises a switching unit arranged to switch between a signal path and a ground path, wherein the signal path is located between the chassis ground of the connector and a signal terminal of the power management circuit, and the ground path is located between the chassis ground of the connector and a specific ground terminal of the first electronic device; and the method further comprises: utilizing the power management circuit to generate a switching control signal, and utilizing the switching control signal to control a switching operation of the switching unit, to selectively enable one of the signal path and the ground path, and selectively disable the other of the signal path and the ground path. when a first turning on signal transmitted from another electronic device within the plurality of electronic devices is received, utilizing a power management circuit of the first electronic device to provide power to a processing circuit of the first electronic device in response to the trigger of the first turning on signal in order to trigger to turn on the first electronic device, wherein the first electronic device is coupled to the other electronic device; and utilizing the power management circuit of the first electronic device to transmit a second turning on signal to a second electronic device within the plurality of electronic devices through an interface circuit of the first electronic device in order to trigger to turn on the second electronic device, wherein the second electronic device is coupled to the other electronic device through the first electronic device; the method characterized in that the power management circuit receives the first turning on signal through a chassis ground of a connector of the interface circuit; the interface circuit comprises a switching unit arranged to switch between a signal path and a ground path, wherein the signal path is located between the chassis ground of the connector and a signal terminal of the power management circuit, and the ground path is located between the chassis ground of the connector and a specific ground terminal of the first electronic device; and the method further comprises: utilizing the power management circuit to generate a switching control signal, and utilizing the switching control signal to control a switching operation of the switching unit, to selectively enable one of the signal path and the ground path, and selectively disable the other of the signal path and the ground path. utilizing the power management circuit to generate a switching control signal, and utilizing the switching control signal to control a switching operation of the switching unit, to selectively enable one of the signal path and the ground path, and selectively disable the other of the signal path and the ground path.