Acer laptop running Vista Home Premium has no sound. The device appears in the device manager with no "!" or "X", however there's an X on the speaker in the system tray. Also, if you left-click the speaker and choose Open Volume Mixer the window that pops up says, No audio device is installed. If you click on Playback Devices when left-clicking the speaker the speakers DO appear as working on the Playback tab of the Sound window. Also, iTunes says there's no sound device installed.
I've uninstalled the device and reinstalled. Downloaded the most recent driver from Acer's website and installed it. I've tried the headphone jack as well, still no sound.