A lot of times, inputs like that don't have a program. Like LINEIN and MIC don't use a program to play it, it's just an input and you can ether enable or disable it. It just gets played back through the speakers. It's almost like a passthrough, there is no program. Other than the volume control that controls that input.

Make sure they are inputs and make sure that nothing is muted in volume control. Also need to make sure you have the correct and latest drivers for the sound installed.