The Samson G Track microphone is very sensitive. If you have it on the heavy metal base on your computer desk it will pick up the vibrations of computer fans. It's vital to get the microphone off the desk using a mike stand with a boom or invest in the G Track spider holder if you want to use the desktop stand.

You can do a test just by holding the microphone with your hand. You should get very little noise apart from the fan noise with will be very faint. That noise is much easier to remove than the vibration noise as removing the vibration noise affects how your voice sounds.

Hope this helps.