2. Right-click My Computer-Properties-Hardware-Device Manager, and open the Audio, Video and Game Controller to see if there is any problem, that is, if there is a yellow ""in front, it will be solved by reinstalling the driver of this device;
3. When there is sound, but there is no speaker, open the control panel-Audio-Visual Equipment-Volume, and put a tick in front of "Put the volume icon in the taskbar";
4. When there is no sound or speakers, open the control panel-Add and Remove Programs-Add and Remove Windows components, check "Accessories and Tools" and click "Next". Then, shut down and restart, the system will prompt you to install new hardware, and follow the prompts.
5. Uninstall the sound card driver and reinstall or upgrade the audio driver;
6. When installing the sound card driver, the prompt "AC chip not found" appears, which may be caused by computer poisoning, or the sound card driver was deleted by mistake due to illegal operation, or the solution to the internal software conflict is to reinstall the system and driver.
7, simply ignore, turn it off and wait for a while before turning it on. Sometimes the sound problem will solve itself. it wont hurt you to try it
8. Start-Control Panel-Sound and Audio Devices-Sound to see if it is muted, and then select windows Default.
9. Click Start-Run, enter regedit, and then press Enter. This will open the registry, click HKEY- current user, click the control panel item, and then click the beep in the sound below to change its value from No to Yes to restart. Did you hear the long-lost switch sound again?
10. Delete the original account and create a new one, so there will be a sound when you turn it on and off. This may be caused by an error in the user profile. You can start the guest user first and try to see if there is any sound when it is turned on and off. If so, you can use the above method. First, create an administrator account, then click on your problematic account, and then follow the prompts to delete it. In the process of deletion, you will also be prompted whether to keep the files of the original account. When deleting, it's best to back up favorites and folders created by installing software in the start menu, and then copy them after finishing.