Am I having a problem with my fan?

[natatos]

I have a unibody MacBook and just a week or two ago I was playing a dvd on it to help me get to sleep and I had it set to turn off a few minutes after the dvd ended but it never did then the next morning I have had this loud noise coming from the fan almost as if its loose or something the computers istat

thats about the lowest fan speed its been in the past three days also I recorded the sound with the built in mic and garageband its kinda loud but for me truning the speaker down to the theered, fourth, or fifth square is filled in is about the right volume but it is REALLY loud.
download it hear if you want to hear it.

 

[Makosuke]

That sounds like a failing fan to me (I'm assuming you've already ejected the DVD and the sound isn't a cracked or unbalanced disk in the drive). If it's under warranty call Apple and get them to fix it. If it's not... well, it'll probably keep cooling the computer until it fails completely, but once it does I'd shut down pretty quickly to avoid overheating anything. Either pay to get it fixed ASAP or go the iFixIt parts route.