Constant fan noise on macbook pro

Hello, my macbook pro (mid 2010 model, 13 inch, 2.4 ghz intel core duo 2 running Mountain lion) is experiencing constant fan activity at very high speed. The CPU however is only used at 9% of its capabilities top. The problem occured after a freeze in adobe Lightroom, since then, the fan noise start as soon as the computer starts (except if i press some keys before i turn it on for some reason, the noise would come back if i shut down the computer and restart it, or simply close it). I'm dully aware that it is normal that the fan is constantly working, but not usually at such high speed (top speed of the system), I checked all the major solutions offered on the net so far with no success (reset SMC, reset Pram, checked if i had some printer activity on the waiting list, checked the activity monitor for any particular demanding activity or tasks and finally i tried to run an apple harware test to see if some temperature probes are broken on the motherboard, however my computer for some reason is not taken care of...).
I also would like to mentionned that i change the original hard-drive not long ago for a hybrid harddrive (seagate momentus XT), yet the problem did not start after the change.
if you do not think of any solutions, you could maybe tell me if its problematic for my computer's fan to run at full speed..
thank you very much for any help you could provide and sorry for the eventual mistakes in english (its not my first language).

Re: Apple Hardware Test. There was no original install disk, as i downloaded mountain lion. While the connection was established to access to Apple hardware test, the test could not run on my mac, the AHT program said that my machine was not supported.
thank you for your diagnostic, it seemed to be a logical explanation, however, thanks to a monitor program i could check that my processor was running under normal temperatures (35°c to 75°c) so at least the temperature informations seems to be correctly assessed by the sensor.

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