Do you have the latest Realtek
driver installed? See
Latest Realtek HD Audio Driver Version
In the System Tray, right-click on the
Realtek HD Audio Manager and select
Sound Manager from the list of options.
Click on the folder icon (highlighted) and then ensure that the two options are set as shown in the
Connector Settings dialogue. Click
OK to close this dialogue panel and then
OK to close the
Sound Manager.