An incorrect connection of an information handling system graphics cable to a display peripheral is automatically detected with an error message presented by the display peripheral. For instance, a graphics projector accepts a VGA input from an information handling system through a VGA cable and port to project information for display. The graphics projector includes a graphics output loop that sends inputted VGA signals to an output port for communication to other peripherals, such as monitor. A cable connector detector associated with the VGA output port detects the incorrect coupling of a cable carrying an incoming graphics signal and displays an error message from the projector that the cable is connected to an incorrect port, such as a depiction of the input and output ports or a video showing disconnection of the cable from the outbound port and reconnection of the cable to the inbound port.