Computer fan being recorded

I think my computer fan is being picked up when I record. What is weird is the the noise doesn’t change when I move my microphone several feet away.

How do I get rid of the sound? Could it be something g other than the fan?

It is the same whether I use the built-in mic or an external mic.

That doesn’t make sense. It can’t be electronic because it happens on both built-in and external. It can’t be acoustic because it doesn’t change when you move the microphone.

What’s the possibility it only happens on playback? Make a recording with noise on it and play it Somewhere Else. iPod, personal Music Player, your mum’s computer.

Also, post a sample of it here: