Noise on my macbook

I'm not sure whether this is to do with the fan but whenever i start my macbook i seem to get this constant noise. I'm not over heating or using the cd drive it just appears whenever i start it up and contiunes.
I'm not sure if i should be worried or what.

Funny! Yesterday I got crazy with my MacBook trying to stop the noise of the fan (and the fan itself). All day long. I restarted in Safe Mode (shift key pressed at startup) and the problem got away (only the basic extensions are loaded in this mode). I supposed it was an extensions' problem (System folder - Extensions Folder) so what I did is to insert the installation DVD (Mac OS X 10.4.8) and installed the OS without deleting my personal files on my Hard Disk. The problem got away. Not a practical thing but it solved it.
Maybe it's easier than that - anybody knows a practical (and quick) solution to this problem? Is it a bug in the Mac OS X latest version?
Thanks!
MacBook Mac OS X (10.4.8)

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