What if there is no sound in win8

First, try to download a new driver. See How to find the hardware driver for instructions on finding a driver.
If the driver cannot be installed, try installing it in compatibility mode:
1) If the driver is already installed, uninstall it. Then, when installing or reinstalling, right-click (or touch) the driver and select <;Compatibility Troubleshooting”.
2) Click “Try the suggested settings", click “Start Program” in the subsequent window.
3) After installation, check if it works.
If the audio driver is installed and working, but there is still no sound, try the following:
· If you have an external speaker:
o Is the speaker properly connected to the PC? Is the power turned on if power is required? Is it turned on?
· Is the sound device disabled?
A. On the desktop, right-click (or touch) the speaker icon in the taskbar and select “Playback device”.
B. Right-click (or touch) a white blank area and select “Show disconnected devices> and “Show disabled devices”.
C. If you see the icon for the speaker and headset at this time, right click (or touch) the correct sound device and select “Set as default device”.
o Audio service not started:
A. Search “Services.msc”.
B. Scroll through the list of services, right-click (or touch) “Windows Audio” and select “Start”.
Also, check to make sure the related items are also started:
Multimedia Class Scheduler
Remote Procedure Call
Windows Audio Endpoint Generator