Reasons and solutions for Windows switch machine without sound

Some time ago, a lot of friends asked "all the settings are correct, is the switch machine does not sound" problem. I after many tests, finally found the cause of the switch machine does not sound and the solution:

First, the cause of the failure

Because of the optimization features of Windows Optimizer, the option to optimize Windows sound and audio configuration is ticked ahead, causing the switch machine to have no sound.

Ii. Solutions

Option A: Use the "Windows Optimizer Master" recovery feature, "Restore the file System properties to Windows Defaults", restart the system, the sound of the switch machine back to normal. Note Do not select the "Optimize Windows sound and audio Configuration" item next time you optimize.

Option B: It is simpler to restore the switching machine by modifying the registry. Start-run--regedit, open Registry Editor, find HKEY_CURRENT_USER\Control Panel\sound branch, the key value of the key beep from "No" to "yes" can be.