The fast way to see if an expansion card has failed would be to remove it when powered down and clean up the pci slot as well as the rest of the case with a can of air cleaner to blast the dust out. It often ends up being a simple build up of dust and dirt over that amount of time and possibly a lift of the card itself in the slot.
Once you have everything dusted out a firm reseat to insure the card is down into the slot fully should see the new hardward found notification. When back at the desktop look in the device manager to see if any "other devices" are now being listed there. Typically a tv tuner card will be considered a multifunction adapter.
Be sure to remove all drivers
and the card's application first however before shutting down, cleaning, reseating, and powering up again to allow Windows to have a fresh detection. Even if you don't see the message for new hardware but still see an item listed under "other devices" in device manager run the driver
/software installer. You may at that time see the new hardware found.