1, check the notebook sound card, cable, and speakers and other equipment is connected properly.

       2. Right click "My Computer" ---- "Properties" - "Hardware" - "Device Manager", open "Sound, Video and GameControllers" to see if there are any problems. Look at the front there is no yellow icon, if any, reinstall the device driver to solve.

       3. When there is a sound but no speaker, turn on the volume of the control panel---sound and video equipment, and put a check mark before “put the volume icon in the taskbar”.

       4, no sound and no small speaker, open the control panel ---- add and remove programs ---- add and delete Windows components. Click the check mark before "Accessories and Tools", click "Next", and then shut down and restart. The system will prompt to install new hardware. Follow the prompts to install.

       5. Double-click on the trumpet - Options - Properties - to adjust the hook on the front of the "microphone".

       6. Uninstall the sound card driver and reinstall or upgrade the audio driver.

       7. The "Cannot find AC chip" prompt appears when installing the sound card driver. There may be a computer poisoning, or an audio card driver that was accidentally deleted due to an illegal operation, or an internal software conflict. The solution is to reinstall the system and drivers.

       8, wait for a period of time after shutting down and then restart the computer, sometimes the sound problem will resolve itself.

       9, start - control panel - sound and audio equipment - sound, see if it is transferred to silent, and then choose windows default.

       10, click Start - Run, enter regedit, enter, which opens the registry, point a few HKEY-CURRENT-USER, and then click on the Control Panel item. Then hit the Beep in the Sound under it and restart its value from No to Yes. Did you hear the long-lost switch signal again?

       11, delete the original account, create a new account, so that the switch machine has a voice, may be caused by a mistake in the user profile, you can first open the guest user guest, try again to see if there is no sound If you have, you can use the above method. First create an administrator account, then click on the problem account, and then follow the prompts to delete it, in the process of deleting it will also prompt whether to keep the original account file, it is best to back up when you delete Favorites, as well as folders created by the installation software in the Start menu, can be copied and copied.