hi ,
welcome tp HP forums
i hope you enjoy your time here
i ca understand that your hear the sounds arund you when you son't use MIC
so this is called Listen to Device
you can deactivate this by
start>control panal > hardware and sound > sound > recording
select your recording device which detects sound
right click > proberites
select Listen Tab
you will find
Listen to this device > checked in
de activate this
then press OK > Ok
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