I have Radeon X300 series graphics card which has the component and s video hookups and i just put my xbox 360

I have Radeon X300 series graphics card which has the component and s video hookups and I just put my xbox 360 component cables into the sockets but nothing automatically happens when i turn on my xbox 360 it doesnt switch the inputs how do i do this?|||The component and s video hookups are to put video out to a tv, not in from another device,.