多谢！我还是找不出毛病。我检查了sound,audio&game controller

里面显示两个：Intel(R) High Definition Audio HDMI 和Realtech High definition Audio. 两个都显示This device is working properly. 请问，这只是speaker 还是包括了microphone?

我也通过control panel里Hardware and Sound/Sound/Change system sounds/recording/microphone properties 里检查了driver.点击了update driver, 选择网上自动找寻，结果：window determined the driver is up to date不需要update。麦克音量也是最大，boost也是＋20dB，但是在listen那里，却听不到麦克风工作。您有何建议？谢谢！