HI, im trying to get audio to play through my tv because right now i have no sound and i have to use headphones all the time. I am connected through HDMI and i have a 7870 video card, a gigabyte z77-DS3H mother board, and onboard 7.1 sound. So is there a way to get audio playing through my pc. I would rather not buy a sound card or speakers, is there like a cable i can use to do this, because my computer does not have the red,white, and yellow cables.