COMPUTER SYSTEM

A computer system is provided to guarantee integrity of an audio signal transferred from a main board to a sub board, and prevent signal distortion and interference by including a connector for transferring the audio signal to the main board and the sub board. A main board(100) includes a main controller(110) processing an A/V(Audio/Video) signal and a main audio connector(130) transferring the audio signal. The sub board(200) includes a sub audio connector(230) directly connected to the main audio connector, and a sub A/V output part(240) outputting the video signal and the audio signal received through the sub audio connector to an external device. The main board includes a main video connector(120) for transferring the video signal. The sub board includes a sub video connector(220) directly connected to the main video connector(120). The video signal transferred through direct connection between the main and sub video connector is transferred to the external device through the sub A/V output part including an HDMI(High Definition Multimedia Interface) port. A path connecting the main controller and the main audio connector is formed on the main board in a pattern type.