Win7 enters the lock screen state, the computer does not sound how to repair

1, check the sound card, cable, and speakers and other devices are connected properly; run anti-virus software for anti-virus;

2, right click “My Computer"----<quo;Properties>---<quo;Hardware> The problem is to see if there is any yellow in the front <; If yes, reinstall the driver of this device to solve it;

3, when there is sound but no small speaker, open the control panel ---- Sound and video equipment----Volume, in the "put the volume icon into the taskbar" before the check mark;

4, no sound and no small speakers, open the control panel ---- Add and remove programs----Add and remove Windows components, check the number in front of "accessories and tools", click “Next”, then, shut down and restart, the system will prompt to install new hardware, follow the prompts to install You can;

5, uninstall the sound card driver, re-run Install or upgrade the audio driver;

6. When installing the sound card driver, “Unable to find the AC chip”, it may be computer poisoning, or accidentally deleted the sound card driver due to illegal operation. Or the internal software conflict resolution method is to reinstall the system and the driver

7, simply ignore it, wait for a while after shutting down and then restart, sometimes the sound problem will solve itself. You may try it. Br>

8, start & mdash; control panel & mdash; sound and audio equipment & mdash; sound, see if it is silent, then select windows default

9, click start - run, enter Regedit, enter, this opens the registry, click HKEY-CURRENT-USER, click on the ControlPanel item, and then click on the Beep in the Sound to change its value from No to Yes. Is it again? I heard the long-lost switch machine sound.