The Multimedia Audio Controller is the unsung hero of the computing experience. Whether it is an integrated chip on a laptop or a high-end discrete card in a studio rig, its role is vital in translating data into the sounds of music, movies, games, and communication. When functioning correctly, it is invisible to the user; when it fails, it is easily identified by the lack of sound and the yellow warning icon in the system's control panel.
Go to Settings > Update & Security > Troubleshoot > Additional troubleshooters and run the Playing Audio troubleshooter. Windows will attempt to find and install the driver automatically. multimedia audio controller