Follow the steps below to make sure your sound is properly configured.
FIRST, make sure you do not have any other devices inserted into any HDMI ports on your machine. Otherwise, that may be what's blocking the sound from your computer to your TV.
1. Right-click on the speaker icon right next to the clock on the bottom right corner.
2. Select playback devices.
3. Look for the device that has HDMI on it.
4. Set this device as the default and make sure that it is enabled.
5. Click OK.