Can't find an audio device in the device management of win7 computer? Is there a solution?

I have written an article before, mainly to explain how to solve the problem step by step after the computer can not sound, one of the most important steps is to check whether the audio device is faulty. Recently, however, a friend responded to Xiaobian, saying that after step-by-step operation, he found a problem magically. In the device manager of win7 64-bit flagship version download iso, he could not find the audio device. Question, how do we deal with it? Let's take a look at it with Xiaobian!
The first case: If you can't find the audio device in the device manager, then the computer's sound card is likely to be damaged. However, relatively speaking, the possibility of this situation is relatively small, and everyone can test it first by the following situations.
The second case: the computer is poisoned. If the system file of the music playing on the computer is damaged, the audio device will not be displayed. You can use the anti-virus software to detect it.
Third case: The audio device is disabled. We can enter the computer device management interface. If you find that the sound card driver has a yellow exclamation point here, it means that there is a problem with the driver. We can download it and install it again on the official website.