Computer device and multi-computer system

A computer device and a multi-computer system are provided. The computer device includes a central processing unit, a wireless connection circuit and a switch circuit. The central processing unit is coupled to a display, and provide an enabling display signal to the display according to a hot plug detection signal provided from the display. The wireless connection circuit receives one of a wireless connection signal and a wireless disconnection signal from a wireless input device. The switch circuit is coupled between the display and the central processing unit, and is coupled to the wireless connection circuit. The switch circuit provides the hot plug detection signal to the central processing unit when the wireless connection circuit receiving the wireless connection signal, and masks the hot plug detection signal from the central processing unit when the wireless connection circuit receiving the wireless disconnect signal.