I have a custom built desktop with an MSI 870a motherboard. Since it has no onboard graphics, I'm using my geforce g100 card from my old computer. My old computer used this card, and an hdmi cable, to connect to my hdtv. It all worked fine then, but now, with my new computer, the audio doesn't work. I am 100% sure that both the tv volume and the computer volume are unmuted, and there was still no sound when both were at max volume. The TV speakers work fine. What should I do? Thanks in advance,