One, sound card setup Error
1, sound output equipment errors, generally connected to the HDMI sound will automatically switch HDMI interface output, but there will be some machines need to manually set up, the method is as follows: WIN7 and WIN8 system
2, right click on the sound icon, select the playback device, as shown in the following image:
3, select the Playback device, pop-up window as shown in the following image:
4, where the default is the computer on its own speakers, the following have Realtek Digital output equipment, this is the audio output of HDMI, right click to select Settings as the default device, as shown in the following figure:
5, set up, the sound will automatically switch to the HDMI output. The TV will be able to have a sound.
Second, HDMI is the graphics output interface, graphics driver installation is not correct
1, view the method is to open Device Manager, as shown in the following figure:
2. See if there are any problems with the sound, video and game controllers and display adapters, as shown in the following illustration:
3, it is best to be able to download the corresponding graphics driver. Complete the installation again. Re-test if there is a problem. If you still need to consider system failure or hardware failure. It's best to reload the system test first.