Hey guys, I am running windows 8.1 on my system and every time I play a game or watch a movie or youtube or anything like that, no sound wants to play through my speakers or my headphones, and I know that both are working fine. This started happening when I removed my graphics card (GTX 960) from my computer and I put it back in straight away. I completely reinstalled windows to try to fix it but there is still no sound. What can I do to try and detect and fix the problem???? Please please help ASAP.