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While closing the laptop without switching it off the laptop normally goes into sleep mode, thats happeninig, but a whistling noise is coming in my laptop while closing it, also when i touch or tap on the screen top the speakers make lot of noise!! there seems to be some problem with the speakers!!

Answers :

It seems that microphone is on.
\015\012To turn it off, double click on volume icon on lower right corner of windows taskbar and then click on mute option for microphone
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