I swapped a faulty Nvidia Geforce GTX 275 with a replacement Geforce GTX 275 that was supposed to be functional. However, I now have a new problem! there's no sound! I've swapped out every set of speakers I own, and I used both audio jacks (one in the front, one in the back). And no luck. I get no sound. I know I have a sound card, because I used to be able to play sound without any difficulty. The only thing I changed was the graphics card. What the hell is going on? Edit: I looked this problem up on Google. Everyone tells me to re-set the sound card to default (because, apparently, even though it's just a GRAPHICS card ... as in ... GRAPHICS ... the manufacturers decided to get cute, and have an overriding sound card in there as well ... a sound card that doesn't even work!). Well, here's the problem: here's what the sound menu looks like on my control panel: As you can see ... my default device hasn't changed. So, the problem must be something else. EDIT: I tried this method: https://www.youtube.com/watch?v=5IrKfA1HQEM But when I entered my bios and switched the onboard audio from "auto" to "enabled," guess what? It STILL DOESN'T WORK!