I agree with others. AFAIK, it's not possible. Most monitors are programmed to switch to one signal port. If you have multiple, it tends to give priority to signal coming in from one priority port as setup by the manufacturer. for example, in my case, if I have the monitor connected to my PC via a VGA cable and to my laptop via the HDMI cable, my monitor gives priority to the HDMI and switches the display to HDMI input.