Horrible buzzing and clicking noise from the fan - DV6 3046eo

Hello!
Two weeks ago the fan on my DV6 3046eo laptop began to make almost continueosly buzzing and clicking noise. My laptop is less than an year old (bought in December 2010) and such noise has never occurred before. I have done some "research" to find the reason, but without luck. I have read on Internet that the fan may be broken or loose. I am just using the web and listening the music. I have to admit I played some demanding games on the computer, like BBC2 and Dirt3. But the problem occured later. I can't imagine what will happen if I play games on my laptop now...
The fan seems to cool down the laptop, but it is like something is hitting it every third second or soand preventing it from running silently. The noise is strange and irritating because the frequency changes rapidly. Sometimes when I move the laptop or hit it a bit gently, the loud noise suddenly disappears and the normal continueosly noise takes over (I am ok with the latter one, though). After some while it appears again. The noise come and go. Reboot doesn't help much. I have also used an airspray can, but to no avail. I am thinking about getting the fan replaced by HP before the 1 year warranty runs out. I am not too comfortable to do so myself. What's the reason for this noise and what should I do?
Thanks in advance!
Sandip

Still no comments?
I am getting sick of this noise. I can't bring my laptop to school because it makes too much noise. Please help me.

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