Weird sounds from fan or hard disk?

Hi,
I have got my Mac book pro in Nov06 and unfortunately on New Years Eve, i discovered another problem with my 15" MBP.
When i was tilting it and putting it on my lap, the fan started to have weird clicking like sounds. It last only for a few seconds and did not carry on for more. I don't think this is normal.
I have heard my fan working and it does not sound same nor does it seem to come from the same position.
This sound comes from the top left side it sound like a mechanical spring that went loose. I read other forums and they mention it could be is the hard disk it that true?
Could anyone advise please if I could get this fan to change and fixed?
Is currently the Apple diligently conducting their quality checks?
Other than this is the screen. This was fixed now the fan.
How much more common problems can there be and I should look out for.
Please advise.
Thanks you all.
Happy New Year

I had the exact same problem. I was using the macbook on my lap and the fans started clicking. It eventually went away as you mentioned. I have not heard it since. I would not worry about it unless you hear it again.

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