So I just got a new graphics card (radeon hd 4650) and after I put it in and turned on my computer I noticed that my sound does not work. When I go to check my sound devices, it does not recognize that my speakers are plugged in. I also checked with my headset and that doesn't work either. Under devices the only thing it says is that ATI HDMI output is not plugged in which im pretty sure is not even for sound. Does anyone know if it is because of my graphics card, and how can I fix it?