How does the Win7 computer make a harsh sound?

1. When this happens, it is after dinner, so when the notebook is abnormal, it really scares me. Not only that, but even the neighbors come out and ask What happened, it can be seen that the situation at the time was more maddening.

2, because my notebook has been in a sharp and abnormal sound, so I first minimize the volume of the notebook or directly click to set the speaker to mute, so the sharp howling stops.

3, but we must not use the notebook to keep the notebook muted. The next small series will introduce you to the solution once and for all. First click on the speaker symbol at the bottom right of the desktop, as shown:

4, then a small window will pop up, continue to click on the speaker symbol in the small window, as shown:

5. Next, the [Speaker Properties] dialog box will pop up. Click the [Level] option above in the dialog box as shown below:

6. Set the microphone to [Level] in the [Level] screen. Mute, as shown:

7, then try to slowly adjust the speaker's voice to the maximum, there is no harsh whistling sound!