Windows might be trying to send audio to a disconnected monitor (HDMI) or a "ghost" device instead of your speakers.
If your audio drivers are installed but you still have no sound in Windows 8, the issue is often caused by a stalled system service or incorrect playback settings. 1. Restart the Windows Audio Service Drivers Installed But No Sound Windows 8
If your speakers appear as disabled, right-click them and select . Windows might be trying to send audio to
Right-click in the bottom-left corner of the screen and select . Drivers Installed But No Sound Windows 8
Windows 8 has a built-in tool specifically designed to find and fix common audio configuration errors. How to Fix Audio Problems on Windows 8 / Windows 8.1