This is because the electromagnetic force around the cables may cause interference. Make sure there are not any electrical cables across your audio cables like headphone wires. Switch off any noisy items, including ceiling fans, televisions, music, and so forth.
Make sure your headphones are properly plugged into the computer and microphone jack. To do so, you can follow the steps below.
How to reduce background noise on mic? The first and simplest thing you can do is to make sure your devices are installed properly and keep a quiet environment.