Okay so I recently downloaded the Portal games on Steam (75% off, too!). I use a regular HP PC, hooked up to my Coby TV (ledtv2316) on the VGA outlet. Whenever I open up the game to play, my screen goes black and a moving bar comes up that says "not supported." The PC doesn't crash or anything, I just can't see my screen. I tried changing my resolution on my PC, but it doesn't change a thing. What's going on, will I be able to play my game?