I finally resolved the sound issue because of KB3110329. I did the following steps:
1) Install all recent critical update near April 16 2016 and then KB3110329.
2) Restart your system. The problem will exist.
3) Go Control Panel -> System -> Device Manager -> expand 'Sound, video and game controller'. Right click the second item (ending with Audio Codec) and select
uninstall to delete.
4) Right click 'Sound, video and game controller' and select 'Scan for hardware changes'.
5) After the sound driver is reinstalled, restart the system. The sound is back.