I recently installed a new hard drive in my Hp Pavilion 752 and have no sound. In device manager I've got a yellow exclamation mark next to multimedia audio controller. I've got an onboard sound device enabled in bios. No sound card. I've got Imperial_GL motherboard. I attempted to download Realtec AC'97 driver from Realtec web. Still have problem. When I tried uninstalling controller and restarting, windows found new hardware and auto restarted over and over. HELLLP!!!!