Some TVs, Samsungs in particular share composite input(yellow) with one of the component input jacks. It may either automatically switch depending on what cables you have plugged in or it may be a menu selection, either composite or component. If your TV only has the one set of component input jacks I can't explain how things were hooked up. Wii can be either composite(standard cable) or 480p component(optional cable), I don't have a PS/2 but does it have HDMI? If so that could go to one of your Samsungs HDMI inputs, if not does your Samsung maybe have a composite side input? With a auto switching TV(that automatically senses either composite or component) there is really no easy way to switch between composite and component without physically unplugging cables, with a menu option and a component switcher switching would be easy via the switcher and changing the TVs input option.