Grounds are often redundant and built into the chassis (of both the component and the laptop), routing back to the power supply. This is to create a sort of "fa

Grounds are often redundant and built into the chassis (of both the component and the laptop), routing back to the power supply. This is to create a sort of "faraday cage" that protects it against harmful electromagnetic interference and discharge (e.g. static electricity). It would be almost impossible to separate it from ground completely.