I swear my Macbook Pro just sneezed.

[poot1234]

Since you are saying it is coming from the left speaker area, the only possible moving part is the left internal fan or the optical drive, as in this picture:

http://www.ifixit.com/Teardown/MacBook-Pro-15-Inch-Unibody-Late-2008-and-Early-2009/590/2

I do believe, if it is coming from that area, that it can't be the Hard Drive or battery.
(This goes for both the unibody macbook pro and the older non-unibody versions)


(Btw, first time post, long time viewer)

 

[milton.sheaf]

Swine flu.

 

[richardsen]

lol

 

[Shaduu]

Since you are saying it is coming from the left speaker area, the only possible moving part is the left internal fan or the optical drive, as in this picture:

The optical drive is on the other side.

That MacBook Pro is upside down. It has to be to access the internals of the machine.

 

[poot1234]

Ahhh yess. Thanks . So to the OP. I would say it's either your left fan or speaker giving out.