HP Pavilion dv9812us
Windows Vista
Recently started getting "No Audio Output Device is Installed" error and no sound (obviously). Followed the Device Manager reinstall process for Conexant HD-Audio SmartAMC HD2 driver to no avail. On a whim I also reinstalled nVidia GeForce series video driver and lo and behold I had sound! Each time I hibernate or shut down, I lose sound. The reinstall of the video driver worked a few times. Now the reinstall of either or both drivers fails to restore audio.
Any ideas?