Windows7 computer How to test the sound card has no sound?

Computer has some games no background music, is not the computer's sound card? How to test?

Test sound

1, in the lower right corner of the Horn button right button, click "Play Device"

2, click the "Speaker", and then click the configuration

3, click the "Stereo", and then click Test, if there is a sound to show that the computer all normal

What if there's no sound?

1, click on the "Speaker", and then click Properties

2, click the level, if they are prohibited, point them.

3, click to enhance, the hook (√) removed

Note: If the above method is invalid, please find a professional computer master.