TV Tuner Trouble

I bought a TV tuner from a computer shop, which totally screwed me up. It cost me a cool hundred, thats a fair wad of hard earned cash, and it just wouldn't work. I mucked around with it for hours and hours, and it still wouldn't recognize any antennas or a game console that was connected to it. I'm going to have to get it replaced with a different model and hope for some luck, and while I'm there, get the monitor I bought replaced because of a dead pixel.