everything else if fine on my laptop. everything else is working fine . first i thought that might be a notification sound of any software, but i figured out there is no such sound on sound system in this laptop, these loud knocking sound sometimes happen very often and sometimes does not happen at all. i search everything to stop this sound but did not find anything. there is no virus nor such thing on my laptop, i keep everything on check very often. i just want to figure out what is the source of this sound to stop it.
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