I recently cleaned out my fans on my Macbook Pro - took me 20 minutes. 15 of that was me freaking out because the bloody thing wouldn't start. Once I figured out I had left residue over the CPU fan sensor and wiped it off, the thing started up just fine (and now runs 10 degrees cooler without all that crap in the fan vent).
On topic: Check for HP firmware updates. My experience with HP laptops is that they tend to have weird issues where their fans either run all the time or the computer never goes to sleep (Vista + firmware issue). Both situations will lead to premature wear on either the fans or the harddrive (in my case, it was the HDD... stupid HP).
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