I have win 7 64 bit and the sound stopped working. The device manager says the driver is up to date. It is a high definition audio driver and I have MSI K8NGM2 motherboard. There are no warnings on device drivers. When I click on sound in control panel, it shows 2 playback devices. One is speakers and it says high definition audio device not plugged in. This is not true. The speakers are plugged in. It also shows Digital Audio (S/PDIF) and says it is working properly. Bars show but I have no sound at all. I have tried disabling and then enabling the device and I've rebooted. Nothing works. Any help will be greatly appreciated.