請教Dell Inspiron 9300 的怪問題

請教Dell Inspiron 9300 的怪問題
I have a Dell Inspiron 9300 Notebook, recently found there is a low beep sound under left side of notebook when click the file name in windows Explorer or the Microsoft Internet Explorer. The sound is not from audio device, when I mute the volume, the sound still there, it look like from the hardware of the notebook, is anyone have meet the same problem? Thank you very much to reply my question.