WOW! It just dawned on me!!

***YOU CANNOT use the TV Tuner card WITHOUT the Video Card***

The video card being the one with the RCA/S-VIDEO.

I remember I tried to use just the tuner, and it did not work. Putting in the Video Card worked.

The video card must contain other hardware required for use. When the system boots up, it polls for the Video Card, but not the TV Tuner card.