Sound card does not have any sound

In the normal use of the computer, found that the sound card does not have any sound, can not be used normally. This occurs because of the following reasons.

1. The general driver after installation, the default output is "Mute", click on the lower right corner of the screen speaker icon, under the volume adjustment slider to see if the "mute" is selected, cancel the "mute" option.

2. The sound card is in conflict with other hardware. In Device Manager, you can see if the sound card option has a yellow "!" and if it does, it represents a conflict.

3. A sound channel is silent. Check the audio line of the sound card and speaker for disconnection or bad contact.