solution
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1. Start ---- run ----services.msc---- in " Name " Find " Windows Audio" ---- left mouse button select it ---- right mouse button ---- and select " Attribute " ----- general ---- Startup type ----- automatic.
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2. Check whether devices such as the sound card, cable, and speaker are properly connected. If it is a virus, you should run anti-virus software for comprehensive anti-virus.
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3. Open the Control panel ---- Add new hardware ----. Next, after the search is complete, click \"No, I haven't added this hardware yet\" and click next. In the dialog box that appears, select \"Click Finish, shut down the computer that is not there, restart to add new hardware.\"
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4. Note that we are talking about restarting after shutting down, not restarting. In general, the problem can be resolved after restarting