1. Misoperation caused the small horn icon to disappear.
Solution: Click the "Start" button to open the start menu → Control Panel → Sound and audio equipment → In the interface of audio equipment, put a check mark in the box in front of "Put the volume icon in the taskbar". If "Put the volume icon in the taskbar" was originally checked, first remove the check mark and confirm, then return to the "Audio Device" interface and check the "Put the volume icon in the taskbar" box.
2. The sndvol32.exe file of the system is lost.
Solution: Copy sndvol32.exe in the complete system (the file is in the directory C:\WINDOWS\system32) and put it back in the directory C:\WINDOWS\system32 where the speaker system is missing.
3. The startup project of the system audio controller is lost.
Solution: Click the Start button to open the start menu → Run → Enter "regedit" in the run prompt box to open the system registry, and open the registry path HKEY _ Local _ Machine \ Software \ Microsoft \ Windows \ Current Version \ Run. Right-click the key of RUN to create a new key named Systray, then double-click the key of Systray, enter C: \ Windows \ System32 \ systray.exe or c:\winnt\system32\Systray.exe in the input box, then press F5 to refresh the valid key of the registry, and finally restart the computer.
4, caused by the virus
Solution: Remove the virus first. In order to prevent the virus from damaging the related files of the sound card driver, it is recommended to reinstall the sound card driver after cleaning.